Making release app use release_directory.
Making release app use release_directory.

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