add mute\unmute methods
Merge branch 'channel-mute' of https://github.com/bradoyler/ember-beats into channel-mute

# By Gavin Joyce (1) and brad oyler (1)
# Via brad oyler (2) and Gavin Joyce (1)
* 'channel-mute' of https://github.com/bradoyler/ember-beats:
  add mute\unmute methods
  added actions hashes to controllers