Revert to older version of TinyMCE.

We had trouble with Cloudfront/hashed files and need more time
to investigate.
This reverts commit e8f53ac9dc6d8a1d9928787635c7c5f7e409a9ec.
Merge pull request #3067 from edx/christina/revert_tinymce

Revert to older version of TinyMCE.
Merge pull request #3070 from edx/adam/middleware

wiki middleware fix (LMS-2461)
Concept added to Studio advanced components
Help paver find the theme directory
Merge pull request #3075 from edx/db/paver-find-theme-dir

Help paver find the theme directory
fix paver theming on devstack (SERVICE_VARIANT support)

When running in devstack, you need to set the SERVICE_VARIANT so that
assets.py knows what environment file to use.  Recall that in devstack
we have all our settings in ../lms.env.json, not just ../env.json.  So
you need to run like this:

    SERVICE_VARIANT=lms paver lms --settings=devstack

Previously you'd get this error:

    Warning: could not find environment JSON file at 'lms.env.json'

Note there is no path on the file, that's the bug.  By making
self.REPO_ROOT absolute, we can walk up the tree and correctly find
the file, which is /edx/app/edxapp/lms.env.json fwiw.
Merge pull request #3081 from edx/sef/paver-fix-devstack-theme

fix paver theming on devstack (SERVICE_VARIANT support)
Skip collectstatic when falling through from rake assets:coffee
Properly get lazily translated exception message
Merge pull request #3083 from carsongee/cg/git_export_lazy_translation_fix

Properly get lazily translated exception message
Release notes 3/26/14

DOC-196
Merge pull request #3069 from edx/markhoeber/documentation/doc-196

Markhoeber/documentation/doc 196

Release notes for 3/27/14
Merge pull request #3082 from edx/db/rake-coffee-to-paver-skip-collect

Skip collectstatic when falling through from rake assets:coffee
Update testing.md file.

How to run Python tests for stub servers.
Merge branch 'release'
Fix failing tender.
Merge pull request #3092 from edx/valera/fix_tender

Fix failing tender.
Update doc string for YouTube stub server.

Included information on how to launch the server
on its own.
EOF
Add an option to prevent multiple logins of the same user.