Skeleton site for users to register and login

The site was modified from the stormpath-flask-example app, which was
used as a starting point. The code for that app is available here:

https://github.com/stormpath/stormpath-flask-sample
Procfile to start the webapp via foreman
Define the Python runtime for use on Heroku
Display notice during registration to verify email
Make server externally visible, use env for port
Populate the page title block in each template