Use jasperpath in client/test.py
Use jasperpath in client/modules/Joke.py
Replace JASPER_HOME with jasperpath.APP_PATH + os.pardir
Use os.chdir inside client/test.py

Otherwise, the transcribe check will fail, if you execute test.py from outside the client directory, e.g. via `python2 client/test.py`

It's a mess that we need os.chdir at all, but hopefully we can remove this soon, if absolute paths are used everywhere.