Communicate important network events to user

[rupl]

Using the tools built in to Socket.io we can offer notifications when the connection is lost or regained, and using the events we already have inside bustashape, they can be notified when others join/leave.

• when connection is lost or timed out
• when connection is restored
• when someone joins your room
• when someone leaves your room

Once these events are handled in the codebase, we can perform other smart actions like #79