Add capybara for integration tests
I don't even
Google Analytics JS was outside of closing </html>

This causes issue with Capybara's XPath selectors and is also
invalid HTML. yay testing!
Minor spec fixes to account for JSON default removal
Our first integration tests

These test that a user can succesfully navigate through the home page and create
a new user account on Tea With Strangers. Additionally, that they can get back
and log in to that account if they're logged out.

Next up: tea time registration