made a special 'module preview' view for Static Tabs in the CMS. Per Tom, he'd like just the Display Name to show up in the static tab editor until the end-user clicks the Edit button

make course about view methods render the about content as a module, so we get all the url rewriting goodness. Also, since we're now handling the url re-writing via the module get_html pipelines, we can remove the link rewriting inside the xmodules itself - which is good because there's a wierd bug in lxml.html rewriting

* in-progress to fixing support for ':' in url_names

window, add xqa modal window, add xqa_key to course metadata

replace_urls

html is in a veritical)

replace_urls

html is in a veritical)

* test enrolls in course before testing pages
* support github edit links with new file structure
* Some pep8 cleanups

* cleaned up error module:
  - only one template
  - save error message in xml and reload
* better display of problem definition and metadata to staff
* save error messages as string, not exception objects.

* get rid of dump to json
* formatting

Split out code to replace /static urls in get_html into a separate module so that it can be used in CMS previews