refactor: remove greenkeeper lockfile

resolves uPortal-Attic#722, the deployment key based approach didn't work out.

.travis.yml

@@ -23,9 +23,6 @@ addons:
 before_install:
   - nvm install node
   - npm install
-  - npm install -g greenkeeper-lockfile@1
-
-before_script: greenkeeper-lockfile-update
 
 script:
   - mvn package
@@ -35,8 +32,6 @@ script:
   - npm run lint-md
   - npm run lint-less
 
-after_script: greenkeeper-lockfile-upload
-
 cache:
   directories:
     - $HOME/.m2

package.json

@@ -56,7 +56,6 @@
     "eslint-plugin-markdown": "^1.0.0-beta.6",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-requirejs": "^3.1.1",
-    "greenkeeper-lockfile": "^1.12.0",
     "jasmine-core": "^2.3.4",
     "karma": "^2.0.0",
     "karma-chrome-launcher": "^2.0.0",