Remove __main__.py
Remove __main__.py

modulexcite/nbgrader,alope107/nbgrader,jhamrick/nbgrader,ellisonbg/nbgrader,dementrock/nbgrader,MatKallada/nbgrader,dementrock/nbgrader,EdwardJKim/nbgrader,modulexcite/nbgrader,MatKallada/nbgrader,alope107/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,jupyter/nbgrader,EdwardJKim/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,jupyter/nbgrader,jupyter/nbgrader,EdwardJKim/nbgrader,ellisonbg/nbgrader,EdwardJKim/nbgrader,jhamrick/nbgrader