Fixing tests
Fixing tests

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