Fixed test_system looking like a test to nosetests, also fixed a class in test_error_module.py that had one class inheriting from another

Reviewed by @brianhw https://rbcommons.com/s/edx/r/17/

Will/jenkins diff cover

Have the draft module store actively prevent non-leaf nodes from being

Fix encoding errors when hashing XML

In these tests, 'rendered_html' is neither rendered, nor HTML.  Name it context_repr, since that's what it is.

Feature user-management autoenroll

Use repr instead of str for getting context data via the system render function, so it works better for non-ASCII data.

partial fix for STUD-145, catch invalid location errors and return a HTT...

Allow a value of 0 for max attempts. STUD-264.

to `origin/master` instead of `master`)

saved as draft.

move url() wrapper into SASS variable

Merge hotfix-2013-06-07

Fix XSS vulnerability in instructor dashboard

fixing bug noticed in production

GST fixes

GST fixes. Removed red error messages preseneted to the user. The errors are now displayed when a flag is turned on. Added graphical_slider_tool tag to the list which shows staff debug info.

Valera/event tracking

We occasionally get UnicodeEncodeErrors from these two places,
because the XML is a Unicode string, and is implicitly encoded to ascii.