some more refactorings
added real employer name to applications emails for #214
seed file fix again
added external listing for admins for #231
fixed applications table for #204..
last changes for #183
small refactoring & fix for #213
refactoring + code format
Merge remote-tracking branch 'origin/develop' into develop-ak
Merge branch 'develop' of https://github.com/tkowark/hpi-hiwi-portal into develop-ak
merged develop-js + small changes