Administer practicals
Made a basic administration for the practical
Fix merge with dev
Fix long line in template
Merge pull request #26 from florisverburg/feature_practical_admin

Feature practical admin
Skills editable
Freaky comments
More freaky comments
Merge pull request #27 from florisverburg/feature_skills

Skills editable
Created tests for Invite and InviteController
Added some more funtionality that was still missing for the correct accepting/rejecting/... of invites
Added some functionality for the withdrawing and resending of invites
Fixed the sending invitations from a person to a group
Finished up the last parts of the invite system and wrote changed the tests accordingly