Use micromatch.matcher on strings only

Its behavior with functions is different (more generic) which broke
expected behavior for some scenarios.

This patch fixes the failing tests that were just introduced.

index.js

@@ -7,11 +7,10 @@ var anymatch = function(criteria, value, returnIndex, startIndex, endIndex) {
   criteria = arrify(criteria);
   value = arrify(value);
   if (arguments.length === 1) {
-    return criteria.length === 1 ?
-      micromatch.matcher(criteria[0]) :
-      anymatch.bind(null, criteria.map(function(criterion) {
-        return micromatch.matcher(criterion);
-      }));
+    return anymatch.bind(null, criteria.map(function(criterion) {
+      return typeof criterion === 'string' ?
+        micromatch.matcher(criterion) : criterion;
+    }));
   }
   startIndex = startIndex || 0;
   var string = value[0];