Fix/cale/pylint cleanup

Handle Heroku's 503 maintenance mode response

The LMS comment client previously would try to parse the response
as JSON, choke, and return a 500 to the client. Now, the LMS client
displays a message indicating that the forums are down for
maintenance.

Start linting envs files, add task to only pylint errors, and move pylintrc file to the correct location

Studio - adding back in older Sass lh() function/mixin

studio - adds back in older lh() Sass function/mixin and moves it to the inheritied/to-be-sunsetted mixins sheet

actually needs to be 255 given unicode requirements

Bugfix/e0d/resize notes uri

Studio - Revised Course Nav Line Heights

Studio - Font Import Method Revert/Fix

studio - reverts google web font import method back to original @font-face syntax since Sass doesn't like google's original method when processing

Set the default celery queue name in addition to the default routing key

Conflicts:
	lms/envs/common.py

Print a message if the requirements files haven't changed.

Batched coffee --watch compilation in smaller batches

Disable marketing registration button for courses that user cannot enrol...

Add Frances Botsford as one of our authors

Add Celery configuration to LMS and CMS 

Drupal: Fix test so that it works with both CMS and LMS settings

Ensure CSRF cookie is present for login and registration pages