make embargo template theme-able

Use "Stanford-style" theming to enable you to put your own embargo
notice up.
missing themed embargo page fails safely to unthemed
Add SHOW_PROGRESS_SUCCESS_BUTTON feature

Show a button at the top of lms/templates/courseware/progress.html if the
lowest nonzero grade cutoff has been reached. Introduce two settings:
PROGRESS_SUCCESS_BUTTON_URL is the href of that button (the course id is
appended); PROGRESS_SUCCESS_BUTTON_TEXT is the text, defaults to
"Download your certificate"
Make the SHOW_PROGRESS_SUCCESS_BUTTON feature more flexible

The button text default is now in the template and i18n-able, a
PROGRESS_SUCCESS_BUTTON_TEXT_OVERRIDE option is offered in settings.
The button url now uses string formatting.
Add test in import code to make sure two overlapping courses aren't imported
Refactored terminology and added loop break for optimization
Updated ORA2 to release-2014-04-15
Fix duplicate save and cancel buttons in Studio

STUD-1531

Also add support for refreshing the modal on custom save
Merge pull request #3361 from edx/andya/rc-fix-duplicate-buttons

Fix duplicate save and cancel buttons in Studio
Merge pull request #3359 from edx/will/ora2-release-2014-04-15

Updated ORA2 to release-2014-04-15
Fix batch enrollment box email sending
Merge pull request #3362 from edx/sarina/fix_batch_enrollment_emails

Fix batch enrollment box email sending
Fix missing call to translate in shoppingcart model
Fix missing call to translate for shopping cart btn
Fix for BLD-993

In certain cases jQuery errors when it is passed an invalid
selector. A fix for this is to silently catch these errors.

Jasmine tests were added to prevent this bug in the future.

BLD-993
Merge pull request #3356 from edx/valera/l73a

Fix for BLD-993
Switch PDF Textbooks to use portable URLs
Studio: updating Sass ui-disabled placholder syntax and creating utility is-disabled class

Studio: revising .fake-link utility class to use Sass placeholder and syncing commenting style

LMS: updating Sass ui-disabled placholder syntax and creating utility is-disabled class

Studio: adding in basic action Sass placeholder for use in enabling/disabling UI

Studio: applying action Sass placeholder to publish/create-draft Unit view actions

STUD-1497
Add javascript backup if pointer-event is not supported by browser

(STUD-1498)
Release notes 4-16-14

doc-272