in AsapiSupport: delegate methods runModel, pausModel and stopModel to the respective AREServices methods
in AREServices.startModel: if model is already running, stop it first: In case of models with native libs a redundant start of the model would cause a duplicate load/start of native libs and consequently crash the Java VM.
Merge branch 'master' of https://github.com/asterics/AsTeRICS
fixed NullPointerException: if model is stopped, ignore receiveData invokations