rework of volume plugin, added volume control buttons for client
Merge remote-tracking branch 'upstream/master' into volume

Conflicts:
	wall/static/style.css
code cleanup; comments
renamed x to vbox
added reference to icons
Merge remote-tracking branch 'upstream/master' into volume

Conflicts:
	wall/res/static/client.css
	wall/volume/static/volume.js
cleanup
Merge pull request #27 from krmnn/volume

Volume plugin