Add files writer to solution app
Add files writer to solution app

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