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
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
Fixed all links in release notes

moved links to links.rst

Doc-327
Merge pull request #3496 from edx/markhoeber/documentation/doc-327

Fixed all links in release notes
Release Notes 4/29/14

Doc-330