stream-sync 2.0.2 released

This version fixed some severe bugs. And I also added more tests to try to cover all the function, the cobertura shows the line coverage has reached 82%.
In addition, as a slight change, the socket test implementation has been moved to the sub package raw as a reference for your own net communication framework integration. And the method getNetSocket of NetSocketFactory throws an IOException now, which should be more reasonable for failures on creating a new NetSocket.