fixing userGrid
fixing groupGrid
create class_type module
minor fixes in classType module
fixing add/edit on backend
fixing relations
fixing course controller
fixing group-course relation
implement course module
Merge branch 'backend' into vkuzb-lvuiui-76

Conflicts:
	app/app.rb
	app/scripts/views/addEdit.js
fixing reverse relation
fixing classType module
improve edit form
Merge pull request #12 from vdanyliv/vkuzb-lvuiui-76

Vkuzb lvuiui 76