diff --git a/.babelrc b/.babelrc
index c13c5f62..002b4aa0 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,3 +1,3 @@
 {
-  "presets": ["es2015"]
+  "presets": ["env"]
 }
diff --git a/package-lock.json b/package-lock.json
index f66c20cf..8b9d5f17 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "shariff",
-  "version": "2.0.1",
+  "version": "2.0.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -485,6 +485,17 @@
         }
       }
     },
+    "babel-helper-builder-binary-assignment-operator-visitor": {
+      "version": "6.24.1",
+      "resolved": "https://registry.npmjs.org/babel-helper-builder-binary-assignment-operator-visitor/-/babel-helper-builder-binary-assignment-operator-visitor-6.24.1.tgz",
+      "integrity": "sha1-zORReto1b0IgvK6KAsKzRvmlZmQ=",
+      "dev": true,
+      "requires": {
+        "babel-helper-explode-assignable-expression": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
+      }
+    },
     "babel-helper-call-delegate": {
       "version": "6.24.1",
       "resolved": "https://registry.npmjs.org/babel-helper-call-delegate/-/babel-helper-call-delegate-6.24.1.tgz",
@@ -498,15 +509,56 @@
       }
     },
     "babel-helper-define-map": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-helper-define-map/-/babel-helper-define-map-6.24.1.tgz",
-      "integrity": "sha1-epdH8ljYlH0y1RX2qhx70CIEoIA=",
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-define-map/-/babel-helper-define-map-6.26.0.tgz",
+      "integrity": "sha1-pfVtq0GiX5fstJjH66ypgZ+Vvl8=",
       "dev": true,
       "requires": {
         "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.23.0",
-        "babel-types": "6.25.0",
+        "babel-runtime": "6.26.0",
+        "babel-types": "6.26.0",
         "lodash": "4.17.4"
+      },
+      "dependencies": {
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true,
+          "requires": {
+            "core-js": "2.4.1",
+            "regenerator-runtime": "0.11.0"
+          }
+        },
+        "babel-types": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "esutils": "2.0.2",
+            "lodash": "4.17.4",
+            "to-fast-properties": "1.0.3"
+          }
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
+          "integrity": "sha512-/aA0kLeRb5N9K0d4fw7ooEbI+xDe+DKD499EQqygGqeS8N3xto15p09uY2xj7ixP81sNPXvRLnAQIqdVStgb1A==",
+          "dev": true
+        }
+      }
+    },
+    "babel-helper-explode-assignable-expression": {
+      "version": "6.24.1",
+      "resolved": "https://registry.npmjs.org/babel-helper-explode-assignable-expression/-/babel-helper-explode-assignable-expression-6.24.1.tgz",
+      "integrity": "sha1-8luCz33BBDPFX3BZLVdGQArCLKo=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "6.23.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-function-name": {
@@ -553,14 +605,57 @@
       }
     },
     "babel-helper-regex": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-regex/-/babel-helper-regex-6.26.0.tgz",
+      "integrity": "sha1-MlxZ+QL4LyS3T6zu0DY5VPZJXnI=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "6.26.0",
+        "babel-types": "6.26.0",
+        "lodash": "4.17.4"
+      },
+      "dependencies": {
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true,
+          "requires": {
+            "core-js": "2.4.1",
+            "regenerator-runtime": "0.11.0"
+          }
+        },
+        "babel-types": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "esutils": "2.0.2",
+            "lodash": "4.17.4",
+            "to-fast-properties": "1.0.3"
+          }
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
+          "integrity": "sha512-/aA0kLeRb5N9K0d4fw7ooEbI+xDe+DKD499EQqygGqeS8N3xto15p09uY2xj7ixP81sNPXvRLnAQIqdVStgb1A==",
+          "dev": true
+        }
+      }
+    },
+    "babel-helper-remap-async-to-generator": {
       "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-helper-regex/-/babel-helper-regex-6.24.1.tgz",
-      "integrity": "sha1-024i+rEAjXnYhkjjIRaGgShFbOg=",
+      "resolved": "https://registry.npmjs.org/babel-helper-remap-async-to-generator/-/babel-helper-remap-async-to-generator-6.24.1.tgz",
+      "integrity": "sha1-XsWBgnrXI/7N04HxySg5BnbkVRs=",
       "dev": true,
       "requires": {
+        "babel-helper-function-name": "6.24.1",
         "babel-runtime": "6.23.0",
-        "babel-types": "6.25.0",
-        "lodash": "4.17.4"
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-replace-supers": {
@@ -616,6 +711,35 @@
         "babel-runtime": "6.23.0"
       }
     },
+    "babel-plugin-syntax-async-functions": {
+      "version": "6.13.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz",
+      "integrity": "sha1-ytnK0RkbWtY0vzCuCHI5HgZHvpU=",
+      "dev": true
+    },
+    "babel-plugin-syntax-exponentiation-operator": {
+      "version": "6.13.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-exponentiation-operator/-/babel-plugin-syntax-exponentiation-operator-6.13.0.tgz",
+      "integrity": "sha1-nufoM3KQ2pUoggGmpX9BcDF4MN4=",
+      "dev": true
+    },
+    "babel-plugin-syntax-trailing-function-commas": {
+      "version": "6.22.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-trailing-function-commas/-/babel-plugin-syntax-trailing-function-commas-6.22.0.tgz",
+      "integrity": "sha1-ugNgk3+NBuQBgKQ/4NVhb/9TLPM=",
+      "dev": true
+    },
+    "babel-plugin-transform-async-to-generator": {
+      "version": "6.24.1",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-async-to-generator/-/babel-plugin-transform-async-to-generator-6.24.1.tgz",
+      "integrity": "sha1-ZTbjeK/2yx1VF6wOQOs+n8jQh2E=",
+      "dev": true,
+      "requires": {
+        "babel-helper-remap-async-to-generator": "6.24.1",
+        "babel-plugin-syntax-async-functions": "6.13.0",
+        "babel-runtime": "6.23.0"
+      }
+    },
     "babel-plugin-transform-es2015-arrow-functions": {
       "version": "6.22.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-arrow-functions/-/babel-plugin-transform-es2015-arrow-functions-6.22.0.tgz",
@@ -635,16 +759,93 @@
       }
     },
     "babel-plugin-transform-es2015-block-scoping": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.24.1.tgz",
-      "integrity": "sha1-dsKV3DpHQbFmWt/TFnIV3P8ypXY=",
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz",
+      "integrity": "sha1-1w9SmcEwjQXBL0Y4E7CgnnOxiV8=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.23.0",
-        "babel-template": "6.25.0",
-        "babel-traverse": "6.25.0",
-        "babel-types": "6.25.0",
+        "babel-runtime": "6.26.0",
+        "babel-template": "6.26.0",
+        "babel-traverse": "6.26.0",
+        "babel-types": "6.26.0",
         "lodash": "4.17.4"
+      },
+      "dependencies": {
+        "babel-code-frame": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+          "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+          "dev": true,
+          "requires": {
+            "chalk": "1.1.3",
+            "esutils": "2.0.2",
+            "js-tokens": "3.0.2"
+          }
+        },
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true,
+          "requires": {
+            "core-js": "2.4.1",
+            "regenerator-runtime": "0.11.0"
+          }
+        },
+        "babel-template": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
+          "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "babel-traverse": "6.26.0",
+            "babel-types": "6.26.0",
+            "babylon": "6.18.0",
+            "lodash": "4.17.4"
+          }
+        },
+        "babel-traverse": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
+          "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
+          "dev": true,
+          "requires": {
+            "babel-code-frame": "6.26.0",
+            "babel-messages": "6.23.0",
+            "babel-runtime": "6.26.0",
+            "babel-types": "6.26.0",
+            "babylon": "6.18.0",
+            "debug": "2.6.8",
+            "globals": "9.18.0",
+            "invariant": "2.2.2",
+            "lodash": "4.17.4"
+          }
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+        "babel-types": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "esutils": "2.0.2",
+            "lodash": "4.17.4",
+            "to-fast-properties": "1.0.3"
+          }
+        },
+        "babylon": {
+          "version": "6.18.0",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+          "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+          "dev": true
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
+        }
       }
     },
     "babel-plugin-transform-es2015-classes": {
@@ -653,7 +854,7 @@
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       "dev": true,
       "requires": {
-        "babel-helper-define-map": "6.24.1",
+        "babel-helper-define-map": "6.26.0",
         "babel-helper-function-name": "6.24.1",
         "babel-helper-optimise-call-expression": "6.24.1",
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@@ -728,21 +929,98 @@
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       "dev": true,
       "requires": {
-        "babel-plugin-transform-es2015-modules-commonjs": "6.24.1",
+        "babel-plugin-transform-es2015-modules-commonjs": "6.26.0",
         "babel-runtime": "6.23.0",
         "babel-template": "6.25.0"
       }
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     "babel-plugin-transform-es2015-modules-commonjs": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.24.1.tgz",
-      "integrity": "sha1-0+MQtA72ZKNmIiAAl8bUQCmPK/4=",
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.0.tgz",
+      "integrity": "sha1-DYOUApt9xqvhqX7xgeAHWN0uXYo=",
       "dev": true,
       "requires": {
         "babel-plugin-transform-strict-mode": "6.24.1",
-        "babel-runtime": "6.23.0",
-        "babel-template": "6.25.0",
-        "babel-types": "6.25.0"
+        "babel-runtime": "6.26.0",
+        "babel-template": "6.26.0",
+        "babel-types": "6.26.0"
+      },
+      "dependencies": {
+        "babel-code-frame": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+          "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+          "dev": true,
+          "requires": {
+            "chalk": "1.1.3",
+            "esutils": "2.0.2",
+            "js-tokens": "3.0.2"
+          }
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+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true,
+          "requires": {
+            "core-js": "2.4.1",
+            "regenerator-runtime": "0.11.0"
+          }
+        },
+        "babel-template": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
+          "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "babel-traverse": "6.26.0",
+            "babel-types": "6.26.0",
+            "babylon": "6.18.0",
+            "lodash": "4.17.4"
+          }
+        },
+        "babel-traverse": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
+          "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
+          "dev": true,
+          "requires": {
+            "babel-code-frame": "6.26.0",
+            "babel-messages": "6.23.0",
+            "babel-runtime": "6.26.0",
+            "babel-types": "6.26.0",
+            "babylon": "6.18.0",
+            "debug": "2.6.8",
+            "globals": "9.18.0",
+            "invariant": "2.2.2",
+            "lodash": "4.17.4"
+          }
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+        "babel-types": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true,
+          "requires": {
+            "babel-runtime": "6.26.0",
+            "esutils": "2.0.2",
+            "lodash": "4.17.4",
+            "to-fast-properties": "1.0.3"
+          }
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+        "babylon": {
+          "version": "6.18.0",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+          "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+          "dev": true
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
+        }
       }
     },
     "babel-plugin-transform-es2015-modules-systemjs": {
@@ -816,7 +1094,7 @@
       "integrity": "sha1-AMHNsaynERLN8M9hJsLta0V8zbw=",
       "dev": true,
       "requires": {
-        "babel-helper-regex": "6.24.1",
+        "babel-helper-regex": "6.26.0",
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@@ -845,18 +1123,29 @@
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       "dev": true,
       "requires": {
-        "babel-helper-regex": "6.24.1",
+        "babel-helper-regex": "6.26.0",
         "babel-runtime": "6.23.0",
         "regexpu-core": "2.0.0"
       }
     },
-    "babel-plugin-transform-regenerator": {
+    "babel-plugin-transform-exponentiation-operator": {
       "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.24.1.tgz",
-      "integrity": "sha1-uNowWtQ8PJm0hI5P5AN7dw0jxBg=",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-exponentiation-operator/-/babel-plugin-transform-exponentiation-operator-6.24.1.tgz",
+      "integrity": "sha1-KrDJx/MJj6SJB3cruBP+QejeOg4=",
+      "dev": true,
+      "requires": {
+        "babel-helper-builder-binary-assignment-operator-visitor": "6.24.1",
+        "babel-plugin-syntax-exponentiation-operator": "6.13.0",
+        "babel-runtime": "6.23.0"
+      }
+    },
+    "babel-plugin-transform-regenerator": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.26.0.tgz",
+      "integrity": "sha1-4HA2lvveJ/Cj78rPi03KL3s6jy8=",
       "dev": true,
       "requires": {
-        "regenerator-transform": "0.9.11"
+        "regenerator-transform": "0.10.1"
       }
     },
     "babel-plugin-transform-strict-mode": {
@@ -906,16 +1195,18 @@
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-      "resolved": "https://registry.npmjs.org/babel-preset-es2015/-/babel-preset-es2015-6.24.1.tgz",
-      "integrity": "sha1-1EBQ1rwsn+6nAqrzjXJ6AhBTiTk=",
+    "babel-preset-env": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.6.1.tgz",
+      "integrity": "sha512-W6VIyA6Ch9ePMI7VptNn2wBM6dbG0eSz25HEiL40nQXCsXGTGZSTZu1Iap+cj3Q0S5a7T9+529l/5Bkvd+afNA==",
       "dev": true,
       "requires": {
         "babel-plugin-check-es2015-constants": "6.22.0",
+        "babel-plugin-syntax-trailing-function-commas": "6.22.0",
+        "babel-plugin-transform-async-to-generator": "6.24.1",
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         "babel-plugin-transform-es2015-block-scoped-functions": "6.22.0",
-        "babel-plugin-transform-es2015-block-scoping": "6.24.1",
+        "babel-plugin-transform-es2015-block-scoping": "6.26.0",
         "babel-plugin-transform-es2015-classes": "6.24.1",
         "babel-plugin-transform-es2015-computed-properties": "6.24.1",
         "babel-plugin-transform-es2015-destructuring": "6.23.0",
@@ -924,7 +1215,7 @@
         "babel-plugin-transform-es2015-function-name": "6.24.1",
         "babel-plugin-transform-es2015-literals": "6.22.0",
         "babel-plugin-transform-es2015-modules-amd": "6.24.1",
-        "babel-plugin-transform-es2015-modules-commonjs": "6.24.1",
+        "babel-plugin-transform-es2015-modules-commonjs": "6.26.0",
         "babel-plugin-transform-es2015-modules-systemjs": "6.24.1",
         "babel-plugin-transform-es2015-modules-umd": "6.24.1",
         "babel-plugin-transform-es2015-object-super": "6.24.1",
@@ -935,7 +1226,11 @@
         "babel-plugin-transform-es2015-template-literals": "6.22.0",
         "babel-plugin-transform-es2015-typeof-symbol": "6.23.0",
         "babel-plugin-transform-es2015-unicode-regex": "6.24.1",
-        "babel-plugin-transform-regenerator": "6.24.1"
+        "babel-plugin-transform-exponentiation-operator": "6.24.1",
+        "babel-plugin-transform-regenerator": "6.26.0",
+        "browserslist": "2.5.1",
+        "invariant": "2.2.2",
+        "semver": "5.4.1"
       }
     },
     "babel-register": {
@@ -8608,9 +8903,9 @@
       "dev": true
     },
     "regenerator-transform": {
-      "version": "0.9.11",
-      "resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.9.11.tgz",
-      "integrity": "sha1-On0GdSDLe3F2dp61/4aGkb7+EoM=",
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.10.1.tgz",
+      "integrity": "sha512-PJepbvDbuK1xgIgnau7Y90cwaAmO/LCLMI2mPvaXq2heGMR3aWW5/BQvYrhJ8jgmQjXewXvBjzfqKcVOmhjZ6Q==",
       "dev": true,
       "requires": {
         "babel-runtime": "6.23.0",
diff --git a/package.json b/package.json
index f027cc4b..316ced30 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.2",
     "babel-polyfill": "^6.26.0",
-    "babel-preset-es2015": "^6.24.1",
+    "babel-preset-env": "^1.6.1",
     "css-loader": "^0.28.7",
     "eslint": "^4.9.0",
     "eslint-config-standard": "^10.2.1",