categories model and controller
bold
Merge remote-tracking branch 'upstream/master'
changed font size
moved disciplines into separate categories MVC
Merge branch 'categories'

Moved the discipline from jobs into a separate categories model.

Categories can be added and edited by the admin only.
add roles (similar to categories) + fixed advanced search
modified search migration
add validation for category / role for jobs
changed validation for companies
changed re-direction and added edit link
Merge pull request #10 from Vars5/master

Changes for 4 July 2013