login, registration, and dashboard page changes for third-party auth
Facebook auth support.
Bugfix for ECOM-199: Visitors removed from auto-enroll pool if they need to authenticate while attempting to enroll
Sets a session variable as soon as a user enters the experimental condition to ensure that they stay in that condition,
even if they later access the control URL (e.g. from a redirect on the login page)
Removed spacebar event handler, because it did more harm than good.
Exclude courses from the auto-registration A/B test
The main django template needs header and footer feature flags.
Improve debuggability when call-count numbers don't match up
Add test to verify bad query behavior of xblock_handler
Add memoization for has_changes
Pre-cache has_changes when computing ancestors
Updated ORA2 tag for release for August 29th, 2014
Merge pull request #5024 from edx/sanchez/ECOM-216-django-template-settings

The main django template needs header and footer feature flags.
Merge pull request #5025 from edx/ora2/release-2014-08-29T17.33

Updated ORA2 tag for release for August 29th, 2014
Add server-side analytics logging for login

Also, removed the client-side analytics for logging in.
Ensures that analytics are collected for third-party-auth logins.
Fixed failing tests related to third-party-auth.
Update forum new post form

Add help text to several fields, update visual styling, and make it
appear in the right-hand pane of the discussion tab instead of sliding
down from the top.

Co-authored-by: jsa <jsa@edx.org>
Co-authored-by: marco <marcotuts@gmail.com>
Handle question posts from comments service
Clean up dead forums front-end code
Unify forum thread views (and templates)
Distinguish forum thread types in rendering

Each thread's type is now included in its post details, and question
threads have marked answers shown immediately below the body of the
initial post.
Add endorsement info to marked answers in forum

Co-authored-by: jsa <jsa@edx.org>