add infinity symbol to calc preview
Make course_id a required arg to split.create_course
and remove attempt to make it unique. Instead raise exception on dupe.
STUD-1359
Fix some simple pep8 and pylint violations
Merge pull request #2863 from edx/sarina/violations

Fix some simple pep8 and pylint violations
fix capa textline to properly use inline if specified when using js preprocessor
fix capa textline display to leave "inline" alone upon status change
fix text-input-dynamath_data test in test_input_templates.py
Minor changes to instructor Analytics tab
Merge pull request #2871 from edx/sarina/idash-analytics-wording

Minor changes to instructor Analytics tab
BLD-905: Fix video resizing in Flash mode.
Added get_courses_for_wiki method.

LMS-2136
Added get_courses_for_wiki(self, wiki_slug) to mongo, xml and mixed modulestores.

This method returns a list of courses which use the particular wiki_slug. It is used for
checking permissions in the course_wiki app.

LMS-2136
Refactored permissions check for course_wiki pages.

CourseRole names have a new format (type_org.number.run). Previously
when checking if a user was staff for a course wiki type_org/number/run
and type_number format role names were checked by parsing user group names.

This logic has been refactored to first fetch all courses which use the
particular wiki_slug and then use courseware.access.has_access to check if the
user has staff permissions on any of the courses.

LMS-2136
When creating a course in studio set a unique wiki_slug for it.

Currently wiki_slug is set to course number. However, since multiple
courses can have the same number this may lead to clashes. So wiki_slug
will be set to org.course.name. To maintain the active wiki_slugs for
xml courses this cannot be changed in the CourseDescriptor.

LMS-2136
Export CourseDescriptor wiki_slug field to xml.

LMS-2136
Merge pull request #2559 from edx/usman/lms2136-wiki-access

Refactor of permissions checking for wiki pages.
Merge pull request #2855 from edx/anton/fix-fullscreen-in-flash

Fix video resizing in Flash mode.
Update dummy Esperanto strings
remove old version of codemirror, to prevent confusion
more robust capa math preprocessor test, and new test for inline