Allow users to create accounts

Users will be able to sign up for a free trial of AccessLint Pro by creating an account on accesslint.com. Clearance is being used to handle user auth.

There is currently no link to sign out, as there are no features for signed in users, and therefore no difference between being signed in and being signed out.

https://trello.com/c/WDFJQGlS/32-customer-can-create-an-account
I like having it on both the home page and the results page, but as this application gets built out and more features are added, I'm not sure in how many places we'll want it.

How about if I turn it into a partial that gets included instead of a layout that is being rendered?