Adding socket.io
Replacing broadcast channels with socket.io
Introducing socket.io
Removing useless socket.io static files - socket.io serves them automatically taking it from the node module
More socket.io
Handling exceptions in asynchronous callbacks in Handler
REST tile property APIS and tile property poll channel

Conflicts:
	src/Tiles.js
Fixing last cherry pick
Some UI
Fixing bug: an Ext JS page cannot be served from a path other than the root.
Merge branch '130225-socket.io'

Conflicts:
	src/Tiles.js