Keep raw title and body separate from displayed title and body so that <mark> tags don't show up in the edit view.

Doing slugging in a less silly way. Requires comment service to return slug as a field and not as the id.

Remove vestigial js include

Fix display of email address on 404 pages

Correct Terms of Use and Privacy static pages

Update Terms of Use and Privacy static pages

improvements in symbolic math checking.

Merging now because it is needed for Physics courses.

Fix news and announcements icons on the frontpage

Feature/cale/cms save validation

Load modules from the mongo modulestore as errordescriptors if creating a regular descriptor fails, but leave the location the same

Make imports into the CMS ignore broken modules, while still loading bad xml as error modules in the LMS

Make ErrorDescriptor continue to use the interface for __init__ that XModuleDescriptor uses, while providing a helper function for constructing from a different set of arguments