Utf8 migration merge

CMS import backwards compatibility

 - edx4edx and 8.01x course repo errors fixed and verified
 - moving forward, it would be nice if the LMS+CMS xml import failed more gracefully when encountering errors in the xml files, when in debug or authoring mode.  For example, an inadvertent xml error in one problem (eg created by a mistake in an import tool used in the CMS) should not bring down the whole LMS. Ditto if one problem gets deleted from the mongodb or filesystem.

Allow importing of courses that don't have the expected path/filename structure for problems and html

This cleans up remaining issues w/ https://github.com/MITx/mitx/pull/155

This improves the performance of the save to github for the cms
(had some minor requests for clarification, but that's all)

Temporary fix to allow pages that inherited the marketing template to display

removing {marketing,marketing-ie,print}.scss from PIPELINE_CSS