#80 Student index just visible for wimis (and admins)
Merge branch 'develop-js' of github.com:tkowark/hpi-hiwi-portal into develop-js
fixed tests related to visibility issue
implemented tests for permissions
Merge branch 'develop-js' of github.com:tkowark/hpi-hiwi-portal into develop-js

Conflicts:
	app/controllers/application_controller.rb
	app/controllers/students_controller.rb
more tests for permissions