SWAT-92

Serve branded footer JSON/HTML/CSS/JS from an API endpoint
in the branding app.  Refactor OpenEdX and EdX.org footer templates
to use the Python version of the API, ensuring that the API
values are consistent with the footer included in main.html.

Detailed changes:

* Added footer API end-point to the branding app.
* Footer API allows the language to be set with querystring parameters.
* Footer API allows showing/hiding of the OpenEdX logo using querystring parameters.
* Deprecate ENABLE_FOOTER_V3 in favor of the branding API configuration flag.
* Move no referrer script into main.html from the edx footer template.
* Rename rwd_header_footer.js to rwd_header.js
* Cache API responses.

Authors:
Awais Qureshi, Aamir Khan, Will Daly

Remove Jobs, News
Change "Vision" to "About"

Move the open edx logo inside the div

Adding a bunch of placeholder views.

indenting.

Making some styles work against LMS sass.

Adding back the old edx footer and associated icons, with a feature flag.

Conflicts:
	cms/djangoapps/contentstore/features/advanced-settings.feature
	cms/djangoapps/contentstore/features/checklists.feature
	cms/djangoapps/contentstore/features/component.feature
	cms/djangoapps/contentstore/features/course-overview.feature
	cms/djangoapps/contentstore/features/course-settings.feature
	cms/djangoapps/contentstore/features/course-team.feature
	cms/djangoapps/contentstore/features/course-updates.feature
	cms/djangoapps/contentstore/features/courses.feature
	cms/djangoapps/contentstore/features/discussion-editor.feature
	cms/djangoapps/contentstore/features/grading.feature
	cms/djangoapps/contentstore/features/html-editor.feature
	cms/djangoapps/contentstore/features/problem-editor.feature
	cms/djangoapps/contentstore/features/section.feature
	cms/djangoapps/contentstore/features/signup.feature
	cms/djangoapps/contentstore/features/static-pages.feature
	cms/djangoapps/contentstore/features/subsection.feature
	cms/djangoapps/contentstore/features/textbooks.feature
	cms/djangoapps/contentstore/features/upload.feature
	cms/djangoapps/contentstore/features/video-editor.feature
	cms/djangoapps/contentstore/features/video.feature
	lms/djangoapps/courseware/features/certificates.feature
	lms/djangoapps/courseware/features/help.feature
	lms/djangoapps/courseware/features/high-level-tabs.feature
	lms/djangoapps/courseware/features/homepage.feature
	lms/djangoapps/courseware/features/login.feature
	lms/djangoapps/courseware/features/lti.feature
	lms/djangoapps/courseware/features/navigation.feature
	lms/djangoapps/courseware/features/problems.feature
	lms/djangoapps/courseware/features/registration.feature
	lms/djangoapps/courseware/features/signup.feature
	lms/djangoapps/courseware/features/video.feature
	lms/djangoapps/courseware/features/word_cloud.feature

the actual urls

Changed constant to uppercase

Comment out tests that don't run correctly without prerequisites.

Comment out tests that don't run correctly without prerequisites.