Merge pull request #6135 from edx/sarina/categorize-common-images

common/lib/xmodule/xmodule/templates/about/overview.yaml

...n/lib/xmodule/xmodule/templates/problem/customgrader.yaml

.../lib/xmodule/xmodule/templates/problem/latex_problem.yaml

common/static/images/mit_dome.jpg

common/static/images/placeholder-faculty.png

common/static/images/placeholder-image.png

common/static/images/search-icon.png

common/static/images/simple_graph.png

common/test/data/2014/about/overview.html

common/test/data/course_info_updates/about/overview.html

common/test/data/manual-testing-complete/about/overview.html

docs/en_us/platform_api/source/course_info.rst

lms/djangoapps/courseware/features/problems_setup.py

lms/static/images/grading_notification.png

lms/static/images/spinner.gif

lms/static/images/wiki-icons.png

lms/static/sass/discussion/_discussion.scss