Fix typo in echo_long celery test function
Scripts use to munge files for mass mailings

Nothing that special, just want to get them backed up so checking them
in.
Merge branch 'master' of github.com:Stanford-Online/class2go into sef-work
Merge branch 'master' of github.com:Stanford-Online/class2go into sef-work
Use vi key bindings for production term sessions
bugs-by-dev report: current list of devs

Still hardcoded, bleh
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
Deletable more cautious about ContentGroup removal

* ContentGroup was always being referenced, even for Deletables without
  any .contentgroup_set attribute. This threw an exception when you
  deleted one of these objects (such as Announcements).  Now we'll be more
  defensive.
  (fixes #1749)
* Some cleanups to comments
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
Starting save button
Merge branch 'master' of https://github.com/Stanford-Online/class2go into jbau-save-button
log error when >1 incomplete exam record found (#1729)

Would be nice to know if this ever happens in production.
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
interactive autograder tests (fix #1726)
interactive ag test: bogus grader endpoint for jenkins (#1726)