Added rotator behavior to feed items.

- Finished styling tweet feed
- Added Browserify task to Gulp
- Added browserify-shim json file to scripts assets folder.
- Added cofffee main module
- Added Feed class for rotating behavior.
- Added animate-enhanced jquery plugin for CSS transition on rotating animation.
- Renamed asset subfolders from 'scss' and 'coffee' to 'styles' and 'scripts'.