Added support for themes

Moved most of the css in a single file to allow the addition of themes
Added themes.js
Added events.once
Support for custom css urls
Fixed wallcounter

Fixed 'Video added successfully' showing for every  own video when
rejoining a room
fixed greynameCount

Fixed the event getting bound more than once
Merge branch 'Dev' of https://github.com/Bibbytube/Instasynch-Addons into Dev