add app3 to multitail-prod
Merge pull request #1891 from Stanford-Online/wescott-master-exercise-work

Wescott master exercise work
Profiling and improving left_nav generation

* Small refactorings to leftnav(), get_full_contentsection_list() and
  lef_nav.html to try to reduce the number of SELECTs. Current runnig
  count 1200->810.
Merge branch 'master' of github.com:Stanford-Online/class2go into sef-work
cache stats should print hourly, not every two min
Fix for #1894.
Fixes many left nav problems:

Mainly, puts context back so that it will hightlight where the student
is and also refactors and cleans up the code a lot.  Maintains the
ajax-loading and caching. closes #1746 and closes #1843

Also closes #1584 by putting them back in for exams / surveys / quiz
Merge pull request #1893 from Stanford-Online/sef-work

Print cache stats to django log hourly instead of every two minutes
fix div by zero error in cachestats (#1901)
Merge pull request #1902 from Stanford-Online/sef-1901-div-by-zero-in-cachestat

fix div by zero error in cachestats (#1901)
Merge pull request #1900 from Stanford-Online/jbau-jrbl-refactoring_left_nav

Jbau jrbl refactoring left nav
Merge branch 'master' of http://github.com/Stanford-Online/class2go into dca_new_working2
Fixes display of time in thumbnails, need to target...

...specific browsers with some additional CSS

	modified:   main/templates/exams/videotest.css
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Update for PR #1895.

Confirmed that no other issues were lurking by importing and running
against db dump from this morning.
Merge pull request #1895 from Stanford-Online/dca_new_working2

Fix for #1894. csv bombs for survey csv submission generation.
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work