Add map to problem_check event with descriptions of student answers

Update translations (autogenerated message)

The map contains a human readable description of the answer if
necessary. It is useful for problem like multiple choice, when the
response of the student is replaced by a moniker. For example "choice_0"
instead of the full text.

Fixes: AN-587

Address Microsite PR feedback - separate out middleware from microsite logic, shor...

New tab (Metrics) in instructor dashboard

Metrics tab shows student data:
  -Count of students opened a subsection
  -Grade distribution per problem

for each section/subsection of the course.

Implemented for both the old and beta dashboard
Controlled by a feature flag 'CLASS_DASHBOARD'
Data is aggregated across all students
Aggregate data computed from courseware_studentmodule

Sylvia/documentation/stud 1293

Release

allow the prevention of the LMS/CMS from being renderable in an iframe

Removing Vagrantfile, no longer used, please see configuration repo

Ned/install jsdraw

Add label to the checkboxes sample template.

add some authorization checks to the Wiki

Converted javascript confirmation dialog on essay grader to modal dialog

Update django-wiki revision
fixes MAT-4

Add error notification for XBlocks in Studio

Fix typo

Start documenting Staff Debug Info

Release and merge conflict resolution

Conflicts:
	cms/envs/common.py
	lms/envs/common.py

Fix case where both old and new transcripts are uploaded, but transcript language isn't one of the new transcripts.

[BLD-889]

Add change for help modal in anticipation of i18n support

Update video docs for multiple language transcripts