Rc/2015 06 29

Dark lang middleware: Check if user is authenticated

Check if the request's user is authenticated before attempting to
get their user preferences. Otherwise, log warnings appear indicating
the UserNotFound error was caught.

TNL-2623 Fix bug where status icons were hidden in image response problems

give the header the right height in the verify flow

ECOM-1808

Resolve merge conflicts

Fix: users without course creation permission were not shown new libr…

Conflicts:
	requirements/edx/github.txt

update xblock only to mark field values as dirty if they've changed (…

force save "download_video" field if not set

set timezone to UTC explicitly

Fix login/logout errors caused by unicode cookie names

Update translations (autogenerated message)

Set Courseware Search to False in default devstack, because it doesn't work.

Make header & footer responsive

Fix SEARCH_ENGINE set logic in settings files

Update i18n-tools to latest version LOC-67

Feature: Shibboleth/SAML SSO

[LTI Provider] Added an authentication backend to log in LTI users

Clean up capa polling to have exponential backoff

Making background pictures printable

fix the source_version xblock after discard changes

Fix dark lang and django.middleware.locale behaviors