fix category tests (some still fail, but there are no more errors)
re-add validation: format of documentation
fix git lib error that caused entity tests to fail
add basic pagination to repository history (#365)
Minimum hets version updated.

Should avoid hets to fail with "unrecognized option `-C'".
Translated HetsTest into RSpec.

Now the failing tests produce helpful error messages.
OntologyTest fixed
OntologyVersionTest fixed
AutocompleteTest fixed
CategoryTest set to pending
change history pagination to kaminari
Merge branch 'augmenting365_paginate_repository_history' into develop

Conflicts:
	app/models/ontology.rb
Merge branch 'develop' into develop.ontohub.org