Also, I replaced a number of tearDown methods with addCleanup instead.
And also remove some unneeded patch.stopall() calls.

add tests

fix

use org

Updated safe_key() so that it: (a) avoids creating keys that
are too long for memcache, and (b) handles unicode in keys, prefixes,
and versions

Added __init__.py, which should have been in the last commit

Pep8/Pylint fixes

This functionality requires the Zendesk URL, user, and API key to be specified
in django.conf.settings. Also, add a flag to MITX_FEATURES (enabled by default)
to control the endpoint and the front-end feature (yet to be added).