multiple mc/sa questions available and fixes

- 3 multiple choice questions can now be attached to a skill
- 3 short answer questions can now be attached to a job opening

- bug fixes:
- "signature" acknowledgement box at end of kiosk application page
- "signature" acknowledgement box at end of kiosk assessment page
- "signature" acknowledgement box at end of kiosk interview page
- un-approved job openings appear on public job openings page
- location field on "view job openings" page always appears as last
option