Igcs 203 ar drone tilt control

The important change is the sendMoveCommand method in the iGCS/Comm/Interfaces/iGCS/iGCSMavLinkInterface.* files.  The rest was to support testing this new method.
should be `sendMoveCommandWithPitch:(int16_t)pitch 
                                                      andRoll:(int16_t)roll 
                                                  andThrust:(int16_t)thrust 
                                                  andYaw:(int16_t)yaw 
                                  andSequenceNumber:(uint16_t)sequenceNumber`