WSPingPong C# webservice and client

1. The folder WSPingPongCS contains a self-hosted C# web service
implemented without interface. A new method bool ball_Check() is added
to check that wether the service has a ball already. This method should
be called by your own client before sending a ball to the service when
you consider it as necessary too.
2. The folder WSPingPongCSClient contains a C# client in which 2
references for accessing the 2 web services are configured. The 2
references should be reconfigured in your own test environment.
merge raycarter's C# WSClient
more to gitignore
make ball static on the server-side

Now the server is working properly. Receives and sends the ball to the
client.
adjust build paths, namespaces and make some config changes
implement Java WebService with codebase from kauk and his tutorial-link