Run Unit Tests on SauceLabs During CI

Problem
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Need to run unit tests across multiple browsers during CI build, for health and sanity. 

Solution
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Use new SauceLabs Support in wf-grunt.

Unit Tests
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None needed. Build stuff only.

How To +10/QA
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Travis CI should pass.

@lancefisher-wf @robbecker-wf @patkujawa-wf @georgelesica-wf @tomconnell-wf @todbachman-wf