Install pandoc on travis
Install pandoc on travis

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