popup search while listening, drag-to-able trash

popup search that allows you to add songs while you're listening,
without interrupting what you're listening to.

trash can indicator added that responds to drag events, and to drop
events, allowing users to drag songs out of their list without playing
them.
reworked how you can remove videos from playlists
frontend styling changes and cleanup for the popup search
scope the :hover selector for the trashcan in the playlist
don't need this anymore
move enter dj mode to left side controls
this is closer to what we want for removing videos
fix the remove videoVideo function, should be all golden now
added a loading message for when the popup search is running
reuse the just and youtube searches for the popup search
add test for videos with no title
Merge pull request #34 from jakswa/master

Drag in new songs while listening, drop unwanted songs in trash