Start of adding sign in tests

This checkin does the following:
add name attribute to sign in fields
register test helper to get application controller
add first pass of simple tests for sign in 

That said, we still seem to have some issues that we should review together. I thought we had everything working today, but as you can see, my sign in test has the click and assert commented out. If you uncomment those and remove the generic passing assert, you will get errors in the console again and the tests will not run with success.

I have a gist created for the logout code we needed, but we don't really need it any longer because the second test that visits the root path again wasn't really needed.

If you run the second test alone, it will fail. Something's amiss somewhere. 

Opening PR for now, so that we can review. As soon as we get things working again, I'll checkin so that we have a working baseline. Should have done that today.