Allow configuration to override links to mobile app stores

ECOM-248 Course Info API. Basic functionality implemented.

ECOM-248 adding factory for about descriptor and test cases for course info api

ECOM-248 adding test cases for couse info api.

ECOM-248 re-factoring code. updating test cases.

Tests for course_about data module

ECOM-248 Adding test cases for the exceptions.

ECOM-248 re-factoring code. fixing quality issues.

ECOM-248 fixing test cases and moved parse video method into utils.

added github username in authors

ECOM-248 removed merging issue of test_data

ECOM-248 removed unused files

Move app-generated context back into properties.
Ignore BI events through segment's webhook.
Ignore events without Data in Properties.

changed the finance_email in the common.py file

added the test for the FiNANCE_EMAIL settings

This PR addresses the following issues:

1) All requests return a 200 OK unless there is an authorization failure. This is deliberate in case the secret key is compromised.
2) Push all of the nasty logic necessary to generate compatible video events into the LMS instead of trying to do that mapping on the mobile devices.
3) Stop using the deprecated "action" field in the segment.io event. According to their support team this field should not be used anymore and is just around for backwards compatibility reasons.

Fixes: AN-3818

remove extra lines

conditionalize address line 2

Upgrades to latest pyfs to support auth not through environment variables

Upgrades to latest pyfs to support auth not through environment variables

Clean up shopping cart processor API.
Fix UUID JSON serialization bug in CyberSource2 implementation.
Update test suite to use new CyberSource2 implementation.
Fix i18n messages in CyberSource2
Enable CyberSource2 implementation by default.

Cf https://docs.djangoproject.com/en/1.4/ref/settings/#std:setting-SESSION_COOKIE_SECURE

rebased and resolve conficts with cdoge/registration_codes

feature enhancement request: added transaction group name text field to the download buttons as an extra optional query paramerter

This is not currently being used in production and will not
be used moving forward since logs are remoted using splunk

STUD-1725

Move modulestore django settings migration code down into the modulestore layer so it works for all django-based callers.

Disabled by default.

Disabled by default.

Refactor get_parent_locations STUD-1663