Create saved work model
Add/remove functionality for saving works for later, plus basic work presenter start
Basic saved works index page
Delete saved works with js from index page
Update tests for marked for later move
Clean up saved works when work is deleted
Add missing li in sidebar
Fix missing subscription form
Updating saved works navigation markup as per sarken
Updating classes at sarken's request
Merge master, resolve conflicts
Remove unnecessary assignment
Merge pull request #1530 from elzj/issue_2495_move_marked_for_later

Issue 2495: move marked for later