Add Diptych Group.
Add Diptych Class.
Add Diptych.
Add kaminari dependency for pagination
Correct page title
Add Kaminari bootstrap3 theme.
Diptychs#index and #show
Add Approximate Year date precision.
Fix date precisions in Diptych migration.
CRUD Diptychs
Fix that updating event would delete it!
Fix that updating role would delete it!