Fix breadcrumbs link
Fix breadcrumbs link

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