change callback
change factory girl.
modified relationships.
fix WikiInformation.accessible_by
Fix: remove visibilities when publised wiki.
moving spec files.
extract test case.
add column for wiki_information#updated_by
change hash syntax
fix spec (wiki_information_decorator_spec)
Implement publish_by!, hide_by!
registered updated_by when wiki_information.save
Add controller spec (wiki_informations_controller_spec.rb )
change relation methods.
remove unused class
Merge branch 'feature/fix_visibilities' into develop