Merge pull request #69 from koding/collaboration-social

collab initiation logic
filetree: give a default size
Merge pull request #70 from usirin/master

filetree: give a default size
RealTimeManager: Added deleteFile wrapper method.
IDE: Full width buttons in chat pane.
ChatView: Forward collaboration related events to settings pane.
SettingsPane: Make element creation lines a separate method.
ChatSettingsPane: Hide End Session button by default.
ChatSettingsPane: Added toggleButtons method.
ChatSettingsPane: Use toggleButtons method.
AppController: Separate chat view creation.
AppController: Code cleanup and code styling.
AppController: Added fetchSocialChannel method.
AppController: Added getRealTimeFileName method.
Collaboration: Implemented realtime file create and delete logic.
Merge pull request #71 from koding/acetz-in-da-collab

Implemented RealTime file create and delete logic.
Merge branch 'master' of github.com:koding/IDE into collaboration
IDE: Fixed changing terminal root directory for default workspace.
AppController: Trailing `/` hurts workspace creation.