* pass user to check_course
* if dark launch feature enabled, users with staff access to course
can see courseware before start date.  Students still can't.
* tests.
* Remaining: enrollment view has custom access control.  Need to check it.

Remove coffee libraries (use the system coffee); don't set the OS NODE_PATH but rather just read it in once and then modify the temporary environments used when executing node.

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

Fixing dependency system for javascriptresponses. In particular, adding a location for node-only packages (that are never sent to the client) in lms/lib/node_modules and adding lms/static/js, lms/static/coffee/* to the NODE_PATH, along with the course's data directory.

Removing compiled js files in data directories before recompiling them; this causes compilation errors to fail loudly.

Switch from exception logging middleware to a django signal handler, so that we no longer swallow Http404 exceptions and turn them into 500 errors

and modify course_navigation correspondingly

* add course and org to full/course.xml
* fix error path in clean_xml script
* commit rakefile change needed by c5334f150c

* move askbot repo into mitx as a submodule
* set settings as in 85865f7221
* remove test_mongo env.
* Refactor tests to use new config structure.
* Add real integration tests--not working due to bugs in course xml. Turned off.

Eagerly load all modules when reading the course from xml, so that users who are already on a problem page can check their answers

Move vendor javascript into common/static/js/vendor, so that they can be shared between the CMS and LMS, and create an html template that includes all of the vendor js needed for the courseware

Uniquify js fragments pulled from XModules, and load both XModuleDescriptor and XModule js into the cms

Removed a bunch of non-necessary javascript from homepage. Most of it was put back in courseware. A new PIPELINE_JS group 'courseware' was created, for pipeline javascript files that should only be in the courseware.