Revert "Merge pull request #30 from mongodb-js/greenkeeper-ampersand-rest-collection-6.0.0"

This reverts commit 70e7a66, reversing
changes made to 19295c3.

Author: imlucas

package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "ampersand-collection": "^2.0.0",
     "ampersand-model": "^6.0.2",
-    "ampersand-rest-collection": "^6.0.0",
+    "ampersand-rest-collection": "^5.0.0",
     "async": "^1.5.2",
     "lodash": "^4.8.2",
     "mongodb-js-errors": "^0.2.1",