Keep nbgrader source when building docs
Keep nbgrader source when building docs

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