Rename appPort#postEvent to appPort#post
Toggle help bubble message between Mute and Unmute peer's audio + test it
Merge pull request #323 from Standard8/postevent_rename

Rename appPort#postEvent to appPort#post, r=@dmose
show 'Type something...' message only for first message
Merge pull request #322 from hardfire/FirstMessage

show 'Type something...' message only for first message
Implement SPADB
Payloads: add a name attributes to SPASPec
SPA: refactor the use of the presenceRequest API
Worker: add an SPADB to the TKWorker
Sidebar: setup the user nick from the worker
Persist and load the SPA setup from an SPADB
Worker: drop the SPADB when signing out
Fix tests
Remove spadb.js from the homepage
Fix a few port calls
Improve readability + speed up tests
Allow the SPA to accept & expose capabilities
Rename Conversation.data to Conversation.context for clarity.
Store SPA capabilities in the Conversation.

- Store the capabilities in the SPA wrapper.
- Construct Conversation using the SPA wrapper.
- Store SPA capabilities within the Conversation.
ChatApp stores received SPA capabilities.