changed font size of exam down to 15px

- and small tweaks to adjust spacing on math stylesheet
progress on backing up/ restoring

- multiple choice questions now restore
- progress is restored
- fixed bug with progress not decrementing after deselecting hotspot
from the map

- need to fix navigation slide out on restore (doesnt come up at all,
and if it did, it wouldnt have the highlighted complete questions and
flagged questions)