edx/edx-platform — pull request #1541 by cpennington (2013-10-30 15:23:31+00:00)
Title: Provide access to the course_id directly on XModules/Descriptors

Fixes [BLD-456] and [LMS-1392], but making sure that we're always asking
XModules about their course_id (since the ModuleSystem has access to that
data).