Increase column size of document_url field; url returned by provider may be very long, especially if filename is quite long
Merge pull request #222 from edx-solutions/mjames/larger_document_url

Increase column size of document_url field
Updated Group Project XBlock Hash for IE9 upload support
Merge remote-tracking branch 'solutions/release' into solutions_master

Conflicts:
	requirements/edx/custom.txt