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
Enforce pylint violation when using old event tracker.
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)
Fix dashboard i18n
Keep closing lines of email together for translation purposes
Add additional context for translators
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
Add management command to create the email opt-in list.