Replaced existing test_none_user_index_access_with_startdate_fails
test with new test now that the tested function has changed and
was causing the original test to fail.

before redirecting to SSL authentication.

they go through the SSL login process in branding when that feature
is enabled.

LMS-1507

Added an expiration_datetime field to CourseModes, intended to eventually replace expiration_date.

Included relevant schema and data migration file.

LMS-1454

* Changed text for "Are you sure you want to refund"...
* Addressed a CR comment adding clarity to student view code
* Converted UTC to pytz.utc

* clean up one last typo

LMS-1387

* make `user_status` more intelligent
* remove some logic from the templates
* rename `parse_error_msg` to `parsed_error_msg`
* fix up and add more tests

LMS-1387

Also includes some tests

Story: LMS-1127

Also includes some tests

Story: LMS-1127

student.views.confirm_email_change: commit/rollback transaction after rendering response instead of before

add middleware to detect students with disabled accounts

add tests

With tests, some settings changes
(all should default to not breaking anything for edx)

Added styling for shopping cart User Experience
- Styled shoppingcart list page
- Styled navigation shopping cart button
- Styled receipt page
- Styled course about page for shopping cart courses

Addressed HTML/SCSS issues

Remove offending body class and unnecessary sass changes

Addresses many review comments on stanford shopping cart

* framework for generating order instructions on receipt page
  in shoppingcart.models
* move user_cart_has_item into shoppingcart.models
* move min_course_price_for_currency into course_modes.models
* remove auto activation on purchase
* 2-space indents in templates
* etc

revert indentation on navigation.html for ease of review

pep8 pylint

move logging/error handling from shoppingcart view to model

Addressing @dave changes

Also added datadog application to commom django apps and set it to use
a local statsd server by default.

* Fix open redirect vulnerability
* Add Logging To AUDIT_LOG : Note I had to change existing tests
  that mocked AUDIT_LOG with this
* Use external_auth.views.SHIBBOLETH_DOMAIN_PREFIX in student.views
* Add a bunch of documentation
* PEP8 / Pylint

* If a shib users type in their email on the regular login page,
  redirects them to /shib-login/
* Modify student.views.accounts_login to handle redirects
  generated by @login_required for courses that use shib for
  access control.
  Redirect those logins to /shib-login/?next=