Merge pull request #41 from cowboy129/master

Add stable release version in README
Remove warning from incorrectly formatted debug message.  Remove todo by making it debug instead of info.
Merge pull request #42 from topping/master

Remove warning from incorrectly formatted debug message.
Use {} for logging
Rename stateListener funtion to emit.
Added configuration: spray.websocket.pmce
minor
renamed package.scala to websocket.scala