Bz19793 - refactor selenium tests

Changes to resolve http://bugzilla.pculture.org/show_bug.cgi?id=19793

Takes the performance changes that ben had recommended for the amara tests and applies them to the MC tests.  Makes use of setUpClass and tearDownClass to allow us to reuse the browser and setup for tests in a particular suite.

 Makes use of setting a browser cookie for when login is required.

Takes out print statements and makes use of logging.

Overall the tests run in about 10 minutes, which is at least 2x faster than previously.  Test failures currently experienced in the jenkins test run are resulting from http://bugzilla.pculture.org/show_bug.cgi?id=19814