Make TinyMCE more tolerant about HTML elements

STUD-1565
fixes templating error (LMS-2560)
Remove verify_html as it isn't supported in TinyMCE 4
Merge pull request #3442 from edx/adam/fix-template-error

fixes templating error (LMS-2560)
Merge pull request #3437 from edx/andya/rc-fix-tinymce

Make TinyMCE more tolerant about HTML elements
Add support for raw HTML editor.

STUD-1562
adjust codemirror window on raw HTML editor
UI String  Updates for Raw HTML Editor Change

Modified the Raw HTML template text and the help string for the Editor
setting.
Tests for raw editor and minor wording changes.
Merge pull request #3449 from edx/hotfix/2014-04-24

Hotfix/2014 04 24 Raw HTML Editor for Studio
Fix i18n of video player string
Merge pull request #3438 from edx/sarina/fix-video-i18n

Don't scrape unnecessary strings for i18n
Fixed transform_url function in WikiAccessMiddleware.

In the current implementation if the path prefix contains the
wiki_path value it gets deleted. For example if the prefix is
'/courses/edx/math101/2014' and wiki_path is '101/' the final
prefix becomes '/courses/edx/math2014'.

LMS-2556
Fix i18n of video transcript
Merge pull request #3476 from edx/usman/lms2556-wiki-urls

Fixed transform_url function in WikiAccessMiddleware.
Merge pull request #3494 from edx/sarina/fix-video-i18n

Fix i18n of video transcript
Merge branch 'release'

Conflicts:
	CHANGELOG.rst
Updated note about accessing wiki after hiding page

doc-310
Merge pull request #3499 from edx/markhoeber/documentation/doc-310

Updated note about accessing wiki after hiding page
Adding additonal path to search for git information on sysadmin dashboard
When viewing the sysadmin dashboard courses tag, we also search the git
repository directory in addition to the DATA_DIR to try and find
the course git repo to get hash, last commit, and last editor information
for each loaded course if available.