Update RaspberryPiTest/RaspberryPi.cs

- mpc_Control constructor added
- mpc_Control.setVolume was called but p.StartInfo.FileName was not set
- removed P=null; at end of each member function
Merge pull request #4 from otti/patch-1



    mpc_Control constructor added
    mpc_Control.setVolume was called but p.StartInfo.FileName was not set
    removed p=null; at end of each member function

Update RaspberryPiTest/RaspberryPi.cs