Update tests for nbgrader release
Update tests for nbgrader release

ellisonbg/nbgrader,jhamrick/nbgrader,EdwardJKim/nbgrader,jhamrick/nbgrader,ellisonbg/nbgrader,EdwardJKim/nbgrader,jupyter/nbgrader,jupyter/nbgrader,EdwardJKim/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,jhamrick/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,EdwardJKim/nbgrader,jupyter/nbgrader