do portable link rewriting on import and add test to confirm it
add portable link rewriting on clone. Added tests.
add ability to rewrite links on the old /courses/<org>/<course>/<run>/jump_to/i4x://<org>/<course> .. intracourseware linking to the new portable /jump_to_id/<id> format
add test files
also support a link rewriting on course import and clone for the following format /courses/[org]/[course]/[run]/. We just need to substitute in the new course-id.
change regex names to better reflect what the actually match on
add another test. Seems like we never had an explicit test on an import into a new course-id. This fixes that
add a few debug messages to get localhost debug information. Also partition out the MongoDjangoToolbar configuration into a separate env config. This is because doing imports on large courses grinds localdev to a halt due to all the stack trace generation.
address PR feedback