Merge private/release into release

[TNL-4073][TNL-4273] Make sure that domain defined for preview exists in

HOSTNAME_MODULESTORE_DEFAULT_MAPPINGS,

Release Candidate rc/2016-03-22

Release Candidate rc/2016-03-22

Restrict preview mode for non-staff users.

Create the security fix #2 for the RC 2016-03-22

Escape full names

TNL-4194

To prevent XSS attacks, we now properly escape any string containing
the user's fullname. Enumerated by searching webview.py for "fullname",
and "git grep"-ing any occurrences. This also exposed some unused strings,
which I deleted for clarity.

TNL-3849/SEC-69

Clear out usages of deprecated vendor prefixes.

MA-2164 adding youtube url to encoded videos

Partially covered in bokchoy at lms/test_lms_instructor_dashboard.py:DataDownloadsTest 

Covered in bokchoy at studio/test_import_export.py:TestCourseBadExport 

Partially covered in bokchoy at studio/test_studio_course_create.py:CreateCourseTest 

Partially covered in bokchoy at studio/test_studio_container.py:EditContainerTest and studio/test_studio_container.py:DisplayNameTest

Testing feature file

Release

Revert "Make Capa problems do initial load without AJAX."

Revert "Make Capa problems do initial load without AJAX."

Fixed accessibility issues with password reset

ECOM-3938

Update translations (autogenerated message)

This reverts commit 9984bbc2.

Create a third shard for lms unit tests.

Update problem-builder to version 2.0.3

This will leverage the nose attrib plugin to allow us
to break tests apart on our build system to run
in parallel on separate nodes.

Rc/2016-03-16

Merge release back to master.

To prevent XSS attacks, we now properly escape any string containing
the user's fullname. Enumerated by searching webview.py for "fullname",
and "git grep"-ing any occurrences. This also exposed some unused strings,
which I deleted for clarity.