requested to merge gwhyte/gitlab-ce:17906-diff-changes-in-wiki-history into master
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Adds ability to diff changes to wiki pages.
app/models/project_wiki.rb re-assigns the commit's project (line 136). A bit of a hack.
Adds a highly requested feature for my user base.
Updates to wiki page history:
New wiki page diff: