TODO list for promoting Gradezilla Gradebook to the Default Gradebook:
[ ] delete app/coffeescripts/gradebook [ ] move files in app/coffeescripts/gradezilla to app/coffeescripts/gradebook [ ] delete app/jsx/gradebook [ ] move files in app/jsx/gradezilla to app/jsx/gradebook [ ] move files in app/coffeescripts/shared that are gradezilla only to app/coffeescripts/gradebook [ ] move files in spec/coffeescripts/shared that are gradezilla only to spec/coffeescripts/gradebook