Update pylint and astroid, reduces pylint count by 400

Add historical course enrollment table.

Exposing course name via Commerce API

The course now includes a read-only name attribute.

XCOM-536

Use the standard enrollment table instead of a custom CCX table for CCX enrollments

Remove unneeded block from courses.html template

Correct email settings URL and rename variable.

User state client tests

Merging hotfix 2015-07-30 release back to master

Make team chat icon appear.

Remove Mustache usage from discussions

Add access response information into view_course_access

Remove remove_input_state.py, as it was one-time fix code, and is not worth porting to the new interface

This required the following changes to the DjangoXBlockUserStateClient
semantics:

1) Changes get/get_many to return XBlockUserState tuples, rather
than state dictionaries or (block_key, state) tuples.
2) Raises DoesNotExist if get_history is called on an XBlock that has
had no data saved to it.
3) Returns XBlockUserState tuples as the results of get_history.

enrollments.

The goal for this PR is to have a single mechanism for registering users and
reducing the number of places where special-casing for ccx courses is needed. The
migration at this point is purposefully limited to convert ccx memberships into
student enrollments when moving forward. No backward migration is in place at the
moment. The ccx membership tables are not removed at this time. It is possible to go
backwards and forwards multiple times with no errors or data loss.

TNL-2913 Extend is_commentable_cohorted to support teams

Removing @contract from `edx-platform/lms/djangoapps/courseware/user_state_client.py`

Christina/team discussion permissions

TNL-2677

WIP: MA-1063 Add versioning and timestamping to CourseOverview

CHANGELOG is dead.

Hotfix 2015-07-23

Move is_commentable_cohorted to django_comment_client

Make context for threads more implicit.

Allow microsites to use logistration page (ECOM-1976)

CAPA CSS: Fixing indicator spacing on dropdown problems