Update Track Selection page

Fix broken certificates-related tests.

Re-enable the edx.org comprehensive theme

Don't render unconfigured marketing links in CMS footer.

Add translator comments

Remove default honor code.

There are English words in these strings, but they are actually specific
values that must appear as these English words, and so should not be
translated.

Fix missing translator comments

Update dashboard for audit track

Turns out if the string literal starts on the next line after the
translation function, then the translator comment is lost.  So, either
close up short strings, or add a dummy empty string on the first line to
concatenate with the real string.

Ugh.

ECOM-2929

Remove cert messaging from audit cert/grade info partial

move enrollment display method to helpers

Raise UnicodeDecodeError exception after logging the exception

Add a Studio view and template to host the Programs authoring app

Percent-based padding on course-content  

The Programs authoring app is a Backbone SPA maintained in a separate repository. The app handles its own routing and provides a UI which can be used to create and publish new Programs (e.g, XSeries). ECOM-2598.

CohortMembership Transaction Fixes

Fixes TNL-363: EdX OpenID provider doesn't handle unicode e-mails

jia/MA-1748 patch read states for users

Enforce order on these events to solve flaky condition.

Upgrade pip to 7.1.2

Audit logs were causing open_id provider logins to fail when
username or e-mail address contained unicode data.

Fixes test_page_scroll_on_thread_change_view failing on chrome

do orphan deletion in a bulk operation (SUST-21)

There are 3 main changes in this commit:
* CohortFactory now sets up memberships properly, so consuming tests do not
need to explicitly touch CourseUserGroup.users to add() users.
* test_get_cohort_sql_queries has been updated to 3 and 9 queries when using
and not using the cache, respectively. This is needed due to each operation
needing an extra queery to get the CourseUserGroup from the CohortMembership.
* Adding remove_user_from_cohort(), the counterpart to add_user_to_cohort().
This is also to keep tests from touching the users field directly, and keep
CohortMembership data in sync.

An issue arose recently due to ATOMIC_REQUESTS being turned on by default. It
turns out that CohortMemberships had been somewhat relying on the old default
transaction handling in order to keep CohortMemberships and the underlying
CourseUserGroup.users values in-sync.

To fix this, I've made all updates to Cohortmemberships go through an
outer_atomic(read_committed=True) block. This, is conjunction with the already
present select_for_update(), will no longer allow 2 simultaneous requests to
modify objects in memory without sharing them. Only one process will be
touching a given CohortMembership at any given time, and all changes will be
immediately comitted to the database, where the other process will see them.

I've also included some changes to get_cohort(), add_user_to_cohort(), and
remove_user_from_cohort() in order to properly make use of the new
CohortMembership system.

LMS: changing blue to pink, ensuring contrast, for Studio/Staff

MA-1742; return read status for GET thread details