Add note task lists feature.
Add date_created and date_modified defaults to board, card and comment models.
Fix task lists “double update” bug.
Debounce Backbone.sync to prevent multiple saves on the same model.
Tweak notes markdown styles.
Fix Backbone.Model.fetch promise errors.
Fix issues with note markdown not being updated on edit.
Tweak note and editor positioning on note detail view.
Fix note task list state toggle on tasks with formatting.
Fix regex to detect tasks in notes.