Merge pull request #4969 from edx/benp/fix-js-tests

Pin coffee-script version to 1.6.1.

1.6.3 is causing some issues.

package.json

@@ -2,6 +2,6 @@
     "name": "edx",
     "version": "0.1.0",
     "dependencies": {
-      "coffee-script": "1.6.X"
+      "coffee-script": "1.6.1"
     }
 }