Collaboration: Add chat participant to session
Merge pull request #80 from koding/collaboration-social

Collaboration social
Merge pull request #81 from szkl/add-participant

Collaboration: Add chat participant to session
ChatSettingsPane: No need to call createParticipantsList.
IDE: Fixed chat styling.
Merge branch 'collaboration' of github.com:koding/IDE into collaboration
ChatSettinsPane: Rename End Session button to Leave Session and use different callback to handle session leave process.
IDE: rerender machineTree if workspaces fetched lazily
IDE: removed unused event