refactor(signaling server): wrap the roomId on data object

Before:
- emitted data from 'chat:joinRoom' event is contained a roomId

After:
- emitted data from 'chat:joinRoom' event is contained a data object {roomId: 123}
chore(room controller): remove unused variable

Removed:
- userId
chore(room controller): remove unused method
refactor(signaling server): remove the namespaces, call and chat

Notes:
It seems to be the PeerConnection.js lib is not supporting namespace
chore(changelog): update changelog
Bump version
Merge branch 'release-0.3.3'