Got profile page working again. The grader for each course is now defined in the data dir as grading_policy.json.

Separate cms and lms auth and env files, and have the LMS that runs with the CMS use the CMS modulestore

* 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.

* new env file to run integration tests with mongo backend
  - needs askbot to get db in the right state
  - needs wiki to load pages successfully
  - not using migrations to make it run faster
* import test courses, check that each page loads without erroring.
* fix NonePointerException in index view to make tests pass
* misc formatting cleanups

* add fix for the file export code--remove tag tail and text,
  not just the children.

* More tests for mongo modulestore, including tweaks to test files
* add location_to_id method to CourseDescriptors
* Implement path_to_location method in mongo.py
  - TODO: does not handle position in sequences yet.
* fix bug in jump_to view.

* Clean up test data for simple, toy courses
* clean up test_mongo.py
* write initial test for path_to_location
* hook up view to use path_to_location

Next: actually implement it :)

* catch exceptions and return a 404 if course not found
* add Location.is_valid(), tests
* stub of jumpto/ view.

* uses xml modulestore, and new error_handler hook

Add optional hide_from_toc attribute to XML elements to support Tutorials (which don't show up in the navigation).

* We do not want to disable existing loggers when setting up our own