Menu - Adds support for Experimental UI section which includes the
new navigation structure in it's current state.

This commit does not reflect the final state of the menu, as there
are current and potential future usability issues to address. What's
included:
 - ability to turn experimental UI on and off per user
 - new navigation structure in experimental mode
 - modified navigation rendering for experimentation
 - tests for new navigation rendering
Experimental Menu - Adding missing folder to the spec.
Experimental Menu - Updating copyright and test files.
Merge pull request #1973 from ehelms/experimental-menu

Menu - Adds support for Experimental UI section which includes the