Skip further holding items that are already held
Use name setting rather than user id
Prevent grading button events from firing twice

This really only happens on mobile for whatever reason, but it's a
simple fix.
Fixed issue with landscape hint sizing
Handle prompts with missing data or strokes

This seems to happen frequently with a slew of Japanese accounts.
Added some more example document titles
Manually call modal as needed when syncing
Rescheduling message after study settings change
Merge pull request #189 from mcfarljw/minor-fixes

Minor fixes