Fix Small Bugs & Small Css Improvements

* [ ] - Fix JSHint Stack
* [ ] - Activate JSHint on 'grunt serve' launch or build
* [x] - Fix Resizable Handles & other images not found
* [ ] - Improve some spacing
* [ ] - Go through UI and fix other small bugs
It was blocking images in zeppelin once packaged.

filerev is a way of adding an id inside of file name (ex: zeppelin_logo12304.png), this way it allows the browser to dump the cached image when the image is changed. Or just use the cache if the name is similar.

The problem with that rule right now is: We don't use a lot of image, and our paths use the normal image name and not the one with id included, therefore we get some 404