Updated gemfile to have sqlite3 since he database.yml refers to squlite ...

Hi Nicole,
When I tried to do db:setup before running your app, it notified me I needed to install sqlite3.  You are using sqlite3 for all 3 databases (dev, test, prod) as shown in your config/database.yml file.  So I added this gem to your gemfile.  After installing sqlite3, your app came up fine.  I believe to push to heroku, you would need to update your prod database to be postgres (you can do that in the config/database.yml file)
Thanks,
Ginger