added pagination to job offers overview, now max. 5 job offers per page #76
Merge pull request #86 from tkowark/develop-ak

Merging develop-ak into develop
adapted view test to pagination #76
Merge remote-tracking branch 'origin/develop' into develop-ja
Changed Chair description data type to text
added chairs to seed
removed uniqueness of role attributes
changed chair attribute in job offer to relationship
adapted view & view test to chair relationship
fixed migration bugs
solved deprecation warnings