6b474724ac
By transparently proxying between the XModuleDescriptor and the XModule, and between their runtimes, we can make them act as a single class, so that we can swap in an actual XBlock instead.
Common test infrastructure for LMS + CMS
data/ has some test course data.
Once the course validation is separated from django, we should have scripts here that checks that a course consists only of xml that we understand.