Allow to pass firmware version from BuildServer

Use default Board Type (prevents to use different boards in FlashTool)
Print MPNG board type on board initialization
Adapted allowing to pass the firmware name and showing boardtype on initialsation for arduplane.
Merge branch 'mpng_ArduPlane-2.76' of https://github.com/smurfy/ardupilot-mpng into mpng_ArduPlane-2.76