Now logging CanCan security exceptions.
Bugfix: couldn't remove files and thumbnails from Deliverables.
Added help text to the Deliverable form.
Bugfix: Share Unit button was broken because of the way Units and Lessons were displayed.
Improvements to page navigation.
Form improvements. Deliverables are now called "Media Items" in the UI.
Bugfix: couldn't add deliverables to lessons; the button was missing.
Version bump.
Bugfix: some models were assigned incorrect parents during initialization.
Bugfix: on nested routes, forms allowed user to create the resource under a different parent. This was confusing.
Added a bottom-margin to embedded videos.
Lessons can now be marked as "Unit introductions". Introductions are displayed differently inside their Units. Migration required.
Last commit introduced a view crash.
Added an "All Lessons" button to Unit#show.
Bugfix: bad links present in Lessons#index.
Cleaned up navigation and page titling. It was confusing.
User may now type tables into the Deliverable's Markdown field.
Version bump.