edx/edx-analytics-pipeline — pull request #23 by brianhw (2014-10-08 00:54:37+00:00)
Title: Update get_filename_safe_course_id to be more restrictive.

Instead of hardcoding knowledge about colons, just replace all
but a well-defined set of supported characters.

And fix a PEP8 violation.

Also the start of adding some testing for unicode characters that are permitted in opaque key identifiers.

@mulby @rocha