Fix help modal css selector
Update calculator tooltip
Second try at a new calculator tooltip
Tweaks to calculator tooltip
More tweaks to calculator tooltip
Remove antiquated cleanup script

This script was originally written to clean up XML scripts. In the more
than two years since it was originally written, the only updates it has
received have been to remove PEP8/PyLint/quality violations.

It's hard to imagine that this is still useful to anyone, though I'm
open to discussion.
config refactor wip
merging from master
Uncomment thumbnail tests
Decorate test functions that require Pillow JPEG support
actually look for an image to verify that a thumbnail has been generated
Update pillow to 2.6.1
pep8 and comments
Moved has_course_access from CMS to student.auth (common)
Change has_course_access definition and doc string

- has_course_access renamed to has_course_author_access for clarity
- Changed doc string to clearly state that it determines whether or not
  a user has write access to a course
If feature flag is enabled, replace the old login/registration pages with the new combined login/registration page.
Only allow users who turned 13 before this year began to opt in.
LMS: revising semantic markup of calculator tooltip content
LMS: revising styling of calculator tooltip content
Make static URLs absolute in handouts, updates, and about for mobile API

JIRA: MA-147