Conflicts:

	lms/templates/staff_problem_info.html
	lms/xmodule_namespace.py

staff_problem_info.html is only put on the page for staff, so we don't need to check staff_access inside it

speeds and don't use the video/default.yaml format.

debug fns from per problem to part of courseware w/ context info passed
as parms. Known issues: ie8 complains that getlog is not defined if you
click on QA and does not show the debug info popup.

window, add xqa modal window, add xqa_key to course metadata

(fixes issues with edit links in multipart problems and video)

uses new 'github_url' dict key in multicourse_settings
this replaces the previous "quickedit" functionality

Made sure that histogram graph doesn't show up for modules without scores. Modified look of histogram graph.

Made sure that histogram graph doesn't show up for modules without scores. Modified look of histogram graph.