sort staff by last_name, first_name, added acceptance test for staff page, #161
removed student search controller, functionality is in the box on the students index page
removed duplicate user_is_admin?
sort chairs by name #161
made all listings similar to job offer pages #161, removed description of chair page on listing
chairs editable by members of chair  #188
Merge pull request #197 from tkowark/develop-ak

Refactorings
edited seed file + one additional test for #208
testworkaround #205
Merge remote-tracking branch 'origin/develop' into develop-ja-listing-ui

Conflicts:
	app/views/students/index.html.erb
made responsible user mandatory for #203
added some more information to job_offer mail for #120
made edit unavailable for jobs that aren't open or pending for #212
added test for user build from identity
changed redirect behaviour on sign in for #183
Merge remote-tracking branch 'origin/develop' into develop-ak