Initial conversion to new sortable lists for rubric criteria.
Fixed weird dragging for the lists. Initial change of annotations list.
Sorting of rubric stuff works.
Merge branch 'master' of git://github.com/MarkUsProject/Markus into sortable-lists
Updated flexible criteria list. Made the add items non-sortable.
Annotations sorting works.
Fix for the test?
Merge branch 'master' of git://github.com/MarkUsProject/Markus into sortable-lists
Frankly, I'm not even sure why the annotation categories sorting even works.
Fix test
Merge branch 'master' of git://github.com/MarkUsProject/Markus into sortable-lists
Prevent text selection in sortable lists.
Cancel previous AJAX requests to prevent sortable from breaking if AJAX calls not completed.
Merge pull request #1559 from arkon/sortable-lists

Fixes #80. Warning: will require database migration.
Merge pull request #1573 from arkon/master

Optimize head ordering