Issue #2104

1. Current quizzes summary report:
  - order the quizzes alphabetically
  - remove in-video quizzes from the list

2. New report - student scores
  - same content as Student Scores report under Reports menu
  - must filter by username for MOOCs
  - can run for whole class if internal
Merge branch 'master' of http://github.com/Stanford-Online/class2go into dca_new_working2
Merge branch 'master' of http://github.com/Stanford-Online/class2go into dca_new_working2
c2g shell function to make it easier to access prod machines
Merge pull request #2117 from Stanford-Online/sef-work

c2g shell function to make it easier to access prod machines
Added comma separated list input to student scores in-line report.
Add report generation delay back in.
Make caching in get_common_page_data optional

* Adds use_cache parameter (defaults to true) to get_common_page_data.
* Uses use_cache=False from inside manage_nav_menu to force a cache miss
  and guarantee admin sees recent changes. Incidentally also means that
  student view of course_info_pages gets pre-cached on the app node the
  admin happens to be working with.
  (closes #2098)
remove sample video and thumbnails (nlp content) (#2122)
removing static bundling of mathjax saves 16MB (#2122)
Merge pull request #2121 from Stanford-Online/jrbl-2098-course-info-addition-doesnt

Make caching in get_common_page_data optional
Merge pull request #2123 from Stanford-Online/sef-2122-remove-big-unused-assets

remove big unused assets (#2122)
Merge pull request #2119 from Stanford-Online/dca_new_working2

In-line report adjustments (#2104)
Video Edit page problem set dropdown no deleted

* Adds is_deleted filter in the view where we prepare the data for the
  "Associated Problem Set/Survey" dropdown on videos/video-slug/edit
  (closes #2042)
Merge pull request #2126 from Stanford-Online/jrbl-2042-check-for-is_deleted

Video Edit page problem set dropdown no deleted
Deleting Exam removes associations from Videos

* Deleting an exam will first look up all the videos which have a
  foreignkey to it, and sets all their .exam properties to None. Then it
  goes ahead with the deletion.
  (closes #2043)
Merge pull request #2127 from Stanford-Online/jrbl-2043-delete-exam-deletes-relationships-too

Deleting Exam removes associations from Videos
Adjust timer JS to make it more concise

	modified:   templates/base.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-navbar-clock-1979-2