Add a test suite and support for latest SDK

After running into a variety of stray issues getting KIF to work with the latest SDK's, I decided to add a general test suite that exercises all (but 2) of the test steps and some interesting cases.  The attached code goes through these cases in about 1.5 minutes although the UI could be a little prettier.

I've also gone through and made the tests work with the latest SDK on-device.  The latest simulator seed appears to be failing with accessibility in general but I had luck with the previous seed.