Tried to implement broadcast.
Merge pull request #7 from cowboy129/master

persist pending packets and transport
Merge branch 'master' of github.com:wandoulabs/spray-socketio

Conflicts:
	src/main/scala/spray/contrib/socketio/ConnectionActive.scala
Renamed GeneralConnectionActiveResolver etc to
LocalConnectionActiveResolver etc.
Added LocalMediator; Moved namespace classes to package namespace.
Tried to implement broadcast.
Avoid subscribe empty topic. Pass multi jvm test.