Create ChannelActivities plugin (with empty contents)
Display channel list by simple <li>
Hide action-bar
Apply some styles
Set href property to anchor
Enable to switch channel by clicking channel list
Change channel color when new message has reached
Reset unread channel color when channel is shown
Display unread message counter
Change color when new mentioned message has reached
Change channel color when channel is active
Merge pull request #20 from everyleaf-internal/channel_activities_plugin

Channel activities plugin