css

This adds CSS live document support on top of sebaslv's PR#3.
@dangoor, that was actually my suggestion. RemoteFunctions used is in brackets repo right now. Instead of copying it here or creating a branch in brackets (which we might end up doing due to the problems with tests), I recommended that @shahabl extends it to facilitate the review process and keep changes granular. In the end, we will merge RemoteFunctions, but for now I think it's best to keep them separate.