Cleanup and added ability to accept MapServer services to ClusteredFeatureLayer

* Missing commas in bower.json causing some JSON malformed errors when trying to bower install via github repo url.
* Some tabs/whitespace caused jshint to fail and broke the build, cleaned that up.
* Added [updates](https://github.com/Esri/esri-leaflet/commit/8697a73761b7b040108f6c22e9de91f6f92cb48b) done to FeatureLayer to ClusteredFeatureLayer to work with regular MapServices.
* Did a rebuild if that's ok, so the dist folder now has latest built files.