Updated style of "DJ-playing" music icon.
Tweaked scrollbar again. Gave it a left border and made it thinner.
Made glyphicon-inverted class.
Updated queue controls + row style.
Fixed crash on emptying queue if DJ.
Restyled queue controls, adding move-song-to-top buttons.
Hopefully fixed 1-off pixel errors with list bottom margins.
Updated empty-queue placeholder text to suggest searching.
Added webkit grab/grabbing cursors for queued songs.
Don't show grab cursor on currently playing queued song.
Improved padding of currently-DJing music glyph icon.
Implemented song escalation button.
Disabled song escalate button if song is already next.

Also added 'next' state to queued song model.
Merge branch 'move-song-top' into dev, adding escalate-song button.

Restyled queue controls.
Added webkit grab/grabbing cursors for queued songs.
Incremented version to 1.1.0-alpha.
Merge branch 'dev' at 1.1.0-alpha.

Features:
  Restyled queue controls, adding escalate-song buttons.
  Implemented song escalation button.

Fixes:
  Fixed crash on emptying queue if DJ.

Tweaks:
  Added webkit grab/grabbing cursors for queued songs.
  Updated empty-queue placeholder text to suggest searching.
  Updated style of "DJ-playing" music icon.