Include setup instructions and instructions for running the app.

If we don't have an app environment variable set, assume we're in the
development environment and set debug=True.

Two new models:
* Interest
* UserInterest (through model)

These allow us to record interests/passions and associate them with
users.

Include a target to delete *.pyc files.

* Database courtesy of Flask-SQLAlchemy
* User models from Flask-User

Ignore compiled Python files and sqlite database.

Let it do the work of user and session management for us.

Database hooks for Flask.