Previously, authentication was done using a URL parameter, which would
appear in various logs. Now, authentication is done more appropriately
with an HTTP header. Note that this requires cs_comments_service commit
cf39aabdd160176ebf206ca19d3ee030161a0b47 or later.

Previously, AJAX calls would return 400, and page views and attempts
to load inline discussions would return 404 if communication with the
comments service failed. Now such problems cause a 500 status code.

remove_open_ended_panel_tab() -> remove_extra_paneltab(). Also, update new forums test factors to use refactored Models.py

Start adding view tests for discussion client. Note that these will not work unless you change your test.py to enable discussion forums.

This reverts commit 2df3fe93.

Conflicts:
	common/static/coffee/src/discussion/utils.coffee

This reverts commit acfd0d9f, reversing
changes made to e4194c99.

Make the django_comment_client return errors that can't be parsed as JSON just as simple strings when in an ajax context

a model change as well)

This reverts commit 05354745.

This reverts commit e7450874.