[entities] Remember an entity has been ejected.

+ `cli/channels`
Merge remote-tracking branch 'origin/master' into guimier
Added a default channel
Merge remote-tracking branch 'origin/master' into guimier
[ajax] + ActiveChannelsAjaxQueryPart
Added current date & backlog support
[channels] Show title
[channels] Open channel
Fixed spelling
[channels] Update persistent list of opened channels
[JSHint] Fixed warnings
[channels] Added close button
Full jQuery UI + theme
Scrollbars shown only if required

And where they are required.
Channel creation dialog
Fonts changes