working demo on each channel
use one single toggle button to play and pause the stream
only one database call for channels in navigation
disable turbolinks to channels as otherwise the stream does not work
only show livestream button if episodes are scheduled
remove indent
Merge branch 'feature/webplayer' into develop

Conflicts:
	app/app/views/layouts/_navigation.html.erb
migration
coverart for each channel
show channel coverart in channel also
Merge branch 'feature/channel-coverart' into develop
fix livestream button problem.
update changelog to current state