Fix history previews
Fix contributor avatars on history page.

* Fix contributor avatars on history page.
* Remove logic from view that raised exceptions (WTF!)
Add spec from previous fix. Start work on StillImage history

* Add spec from previous fix
* Add failing spec for StillImage history
Fix broken StillImage history page

* Upgrade acts-as-taggable-on to latest version
    * Create migrations as per acts-as-taggable-on README
    * Tweak them to account for the existing Kete schema and data
* Create Tagging model to keep old code working
Merge branch 'ek-setup-staging' into ek-fix-history
Disable query optimisation that was breaking Document history page

* Remove README link to expired heroku app
* Disable query optimisation that was breaking Document history page.
DRY up spec for history pages
Merge pull request #8 from kete/ek-fix-history

Fix history pages