Usefull variables for translation

add license to a11y_tools.js

add tests, some reorganization of js tests

skip "toBeFocused" tests for now

add middleware to detect students with disabled accounts

add tests

Middleware is a better place for this, rather than navigation.html
template

change to use regex to do the domain mappings. Also add config to AWS to be able to set from configuration file.

handle cases where HTTP_HOST is none, like in unit tests

add linefeed at end

fix up regex matches

switch to use thread local storage to hold the request itself

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convert over to use open source 3rd party library

convert over to use django-cum

add unit test

remove comment

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add comment to config setting

fix comment

use better regex for localdev

no need to break

no need to wrap an imported function, it's visible to any file that is importing us

add comment

add unit test

clean up test

use a separate env file to set the preview hostname

@jzoldak showed me that setting `USE_I18N = DEBUG` didn't actually accomplish
what I had hoped it would -- changing DEBUG didn't also change USE_I18N.
This pull request accomplishes what I was trying to accomplish, without being
quite so clever about it.

We want USE_I18N to be on in development, but off in production. Tying
this setting to the DEBUG setting accomplishes that neatly.

set max enrollment for downloads to 200

Add AUTOMATIC_VERIFY_STUDENT_IDENTITY_FOR_TESTING flag so that acceptance tests can run through certificate identity verification flow.

There's no need to display a traceback for every failed content load,
the comment before the log line even says so.

The exceptions shown before tests are run are because of the eager
initialization of the modulestores.  They don't need to be initialized
then, that just speeds the responsiveness of servers.  Putting off the
initialization means they get inited as needed, and the log lines get

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

* Add unit test coverage for this "exclusion from tracking" logic
* Exclude based on regex match instead of raw string comparison
* Exclude heartbeat requests from tracking