Fix for #1919

Handles AJAX success case with new function that's similar to the
existing error handler

	modified:   templates/exams/view_exam.html
Remove unnecessary console logging

	modified:   templates/exams/view_exam.html
Minor change to AJAX Save Answers

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Minor clean-up for Save Answers error path

Add supplemental text if it exists, store unsaved data in localStorage
so it won't be completely lost in all cases. TODO: Add more robustness
here

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Move conditional to single line

	modified:   templates/exams/view_exam.html
Remove console.log

	modified:   templates/exams/view_exam.html
make fixes stated in PR
Merge pull request #2020 from Stanford-Online/wescott-master-exercise-work

Fix for #1919 (branch Wescott master exercise work)