Minor changes to video page + Completed playlist page.

-Color scheme changed from blue/dull red/orange to green/dull red/orange
-Renamed videos.css class names to make it reusuable by other pages (i.e. each_video_wrapper => each_wrapper)
-removed the watch link (next to edit and delete). instead video will load when you click on the video title link.
-Added routes to the icon buttons below the header.
-Added icons instead of words for the navigation bar
-rerouted sign-up page to go to log-in page once succesfully signed up
-removed the playlist list on videos page and instead put it on it's own page ('/playlists')
-Matched the layout of Playlist to that of Video.
-Completed a test run for functionality and passed all test.