Removed the indexing of the course module listing in the course instance view.
CAUTION: This commit includes schema migration. The schema migration makes max_length of a CharField longer.

Made the CourseModule name field longer. It is up to 255 characters now. Tested and tt seems to wrap nicely in the view even with 10 exercise buttons (Firefox and Chrome).
Merge pull request #63 from Rubinous/course_module_numbering

Course Instance View - Course Modules