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Add logging to save item

Add event tracking with configurable backends

Adding styles to fix issue BLD-221.

If you make the window smaller, and keep reducing it's size, at some
point the controls will not fit, and some will be bumped to the next row.
When the widnow is resized below the width 1024, extra styling rules
will kick in to fix this issue. The word "Speed" from the speeds control
will be temporarirly hidden.

Add mitxmako.middleware to fix workers

Revamped + Enhanced Shibboleth support

The home icon and discussion topic drop-down icon now have text that is
visible only to screen readers. The visual change between the icon and the
topic name with down-arrow is now achieved with the CSS visible property
instead of the opacity property, so only one at a time will be visible to
screen readers as well as visually.

Fix element name conflict

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LTI module with tests

LTI blade allows to include LTI components to courses.
Python integration, Jasmine and acceptance tests are included.

Revert "Merge pull request #804 from edx/valera/lti_module"

This reverts commit 2894b21c, reversing
changes made to 34d0fe15.

LTI module with tests

User verification / validated certificates feature

This reverts commit ef4b7b9b.

Rewriting expect() calls to use Jasmine jQuery event spies. Making individual
it() tests independent.