Added filter by feed function and added event listener to feeds section of side-bar.
Modified render filtered to remove filters when user clicks on "All feeds"
Added bold to filtered by feed
Added sorting function and invoked for categories and fields in side-bar
Modified categories create to render json when new category created.
Implemented add category form and rendered in side-bar
Ensured uniqueness of new category for user
Merge branch 'master' of github.com:emreiser/loopd
Resolved merge conflicts