Enhanced fetch_modules with ability to parse lecturer and courses #22
Added course model and migration #22
Removed unused ModuleReview #22
Removed lecturer from course and added courses fixture #22
Refactored fetch_modules #22

Refactored fetch_modules #22
fetch_modules now links modules to courses #22

Made many2many optional and fixed pep issues #22

fetch_modules links DocumentCategory to Course #22
Updated README with fetch_modules instructions.
Merge pull request #137 from studentenportal/iss22

Modules are now associated with courses.