Make special database columns uneditable
Merge branch 'master' of https://github.com/swisscom/cleanerversion into uneditable
Merge branch 'master' of https://github.com/swisscom/cleanerversion into uneditable
Merge pull request #25 from gidoca/uneditable

Make Versionable fields non-editable
Merge remote-tracking branch 'origin/master' into migration_awareness

Conflicts:
	versions/models.py