This commit pulls in changes from #4487 that implements keyword
substitution for bulk emails. With these changes, an instructor can
include keywords in their bulk emails which will be automatically substituted
with the corresponding value for the recepient of the email. Keywords are
of the form %%keyword%%, and the keywords implemented in this commit include:

%%USER_ID%% => anonymous_user_id
%%USER_FULLNAME%% => user profile name
%%COURSE_DISPLAY_NAME%% => display name of the course
%%COURSE_END_DATE%% => end date of the course

Client-side validations have also been implemented to ensure that only emails
with well-formed keywords can be sent.
The architecture is designed such that adding in new keywords in the future
would be relatively straight-forward.

Limit Upload File Sizes to GridFS

hotfix-2014-12-11

Update pillow to 2.6.1

MA-182 Fix Mobile Subtitles.

round-off weight value while returing grading policy

TNL-884

moving defaults for yaml config out of common.py

This reads configuration directly from yaml
and imports it directly into settings

Add DEFAULT_FILE_STORAGE configuration.

It might be different from the requested filename.

Tests in common are run with both CMS and LMS configuration (with different env files). Ensure the DEFAULT_FILE_STORAGE variables are in both environments.

Fix Mako templates to always use updated request context

add find_fixme task

Upload CSV file for cohorting students

TNL-735

Fixed the edX middleware to lazily create request
context for Mako templates, so that it is based on
any changes made to the request object.

Verified that with this fix the "Instructor" tab is
correctly hidden when a staff member is viewing
the course as a student.

Clean up common/ images - moving, deleting, renaming as necessary

OPEN-328

OPEN-328

spinner.gif and spinner-on-grey.gif are the same file.
Explicitly give the LMS a spinner.gif file.

OPEN-328

OPEN-328

OPEN-328

Corrected Import Statement

MA-157 Move context back into properties.

Move app-generated context back into properties.
Ignore BI events through segment's webhook.
Ignore events without Data in Properties.

Release 2014-12-10

This commit puts a limit on the size of files that
course staff can upload to MongoDB. The limit is
enforced on the frontend in javascript as well
as backend via the /upload endpoint.

The limit is hard-coded in cms/envs/common.py and
may be changed according to the user's custom
needs.

If the user tries to upload a file that's too
large, an error message will pop up, with a
customizable url that pointing the user to an
external page with an alternate upload procedure.
This url is specified im cms/envs/common.py.
If not set, this url will not be displayed.

Fix assert.

Assert mistakenly had comma instead of double-equal - now correct.

Legacy dash cleanup

Adam/add defunct states for cart