Atmosphere

Switched from ICEPush to Atmosphere. It will by default hold a websocket-connection between the client and server, and fall back to long-polling when needed.
At the moment reload() is still called on the client side, i.e. all data is reloaded when a push is received, but Atmosphere supports including data in the push itself, so the data to update should in the future be included here instead of having to reload everything.