Added gitignore in pandoc converter (for venv).
Added gitignore in pandoc converter (for venv).

noisebridge/PythonClass,razzius/PyClassLessons,noisebridge/PythonClass,PyClass/PyClassLessons,PyClass/PyClassLessons,razzius/PyClassLessons,razzius/PyClassLessons,razzius/PyClassLessons,PyClass/PyClassLessons,noisebridge/PythonClass,noisebridge/PythonClass