Changed from double-click to single-click for adding tracks to playlist

Change-Id: I721d3dee74710c69827907a7d012cf9c4b92ae1c
Rmeove unwanted paddings and margins from narrow screens

Introduced by Responsive Bootstrap.

Change-Id: Idf7075cfc466750adab6a1c80e3543607b287a0e
Actually show the volume bar

Change-Id: I9d90a68113f110b37638851abe3edca5675c8f12