Makes new tables that are queryable to get aggregate data on student per
problem information and student grades at three levels: overall course,
assignment type, and assignment.

Provides UI in instructor dashboard to view student metrics using
class_dashboard app.

Remove primary keys from queryable tables
    De-normalize user info of id, username and name into queryable tables.

Make all tests pass

* use default parameter	in get_or_create for non-unique-together
  values
* properly set module_state_key

Conflicts:
	lms/envs/test.py

Fix acceptance tests to capture images for paid cert flow

Re-enable signature checking of Software Secure postbacks

Force save of photo_id_key on upload

Wait for flash to load before trying to detect a camera

Conflicts:
	common/djangoapps/student/views.py
	lms/envs/common.py

Conflicts:
	AUTHORS
	CHANGELOG.rst
	common/djangoapps/student/views.py
	lms/djangoapps/bulk_email/admin.py
	lms/djangoapps/bulk_email/migrations/0001_initial.py
	lms/djangoapps/bulk_email/models.py
	lms/djangoapps/bulk_email/tasks.py
	lms/djangoapps/bulk_email/tests/test_course_optout.py
	lms/djangoapps/bulk_email/tests/test_email.py
	lms/djangoapps/bulk_email/tests/test_err_handling.py
	lms/djangoapps/courseware/courses.py
	lms/djangoapps/courseware/tests/test_courses.py
	lms/djangoapps/instructor/views/legacy.py
	lms/envs/aws.py
	lms/envs/common.py
	lms/static/sass/base/_variables.scss
	lms/templates/courseware/instructor_dashboard.html
	lms/templates/dashboard.html
	lms/templates/main.html

New app cme_registration
New table cme_registration

Tiny change to pull in student verification settings on aws envs

Software Secure message signing and callback

Add more certificates test for newly implemented features

Hotfix/progress 500s

Detect cameras and flash

Renzo/instrument verified cert flow

Change locators of links to match updated ids

Fix/frances/vcert receipt

Verification: UI Edits

Add mitxmako.middleware to fix workers