Add navigation div to be used uniformly
	modified:   templates/exams/videotest.js
	modified:   templates/exams/view_exam.html
Address repetitive feedback described in #1714

Also add some comments in prep for refactoring code

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Address #1713 and add some exam navigation styles
	modified:   templates/exams/videotest.js
	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work

Had to add back in some of Jason's stuff and mine when resolving conflicts

Conflicts:
	main/templates/exams/view_exam.html
Fix for #1506 and fix for button layout

Mostly change styles, re-parent check/hide answer buttons

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Fix layout wrt Check/Hide Answers buttons and Explanation div

CSS style changes only

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

Conflicts:
	main/templates/exams/view_exam.html

Commented out stuff to make way for Jason's all-in-one Submit button
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Fix spacing between buttons

Add margin-right of .5em to all buttons within exam-navigation div,
remove margin-left from saveWorkBtn

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Merge pull request #1761 from Stanford-Online/wescott-master-exercise-work

Wescott master exercise work