Merge pull request #38 from cowboy129/master

Upgrade spray to 1.3.2-20140428
Degraded to parboiled1, to resolve conflict from shapeless which is transitively depended by spray-routing and parboilded2.
Let SocketIOServerConnection/SocketIOClientConnetion to be actor extendable instead of extend actor.
updated example code in README
Upgrade spray-websocket to 0.1.1-RC1