Add keyboard handler to quiz JS.
Update CME certificate system so certificate dispaly is outside the page code.
More work on the certificate page.

 * make subclassing easier
 * make methods to get selected credits on form submit
Add checkbox helper JS to certificate printing page.
Whitespace
Re-create earned credits if they were deleted.
Make it possible for subclasses to preselect list options on the certificate print page.
If value is pre-selected, print certificate automatically.