Not ready
Working add student button, and delete student (on group#edit)
Merge branch 'button'

Conflicts:
	app/views/groups/index.html.erb

Done!
Added a page listing all subjects (choise/index)
Merge branch 'subjects'

go go
After merge
Pasha magic. Added mark lists in subject_groups/show
Newsfeed page
remove idea files
merge commit