Merge pull request #9 from districtem/master

Update README
Simplify database configuration

* Remove comment cruft
* Remove custom user/password
Merge pull request #12 from calebthompson/ct-simplify-database-config

Simplify database configuration
Merge pull request #14 from districtem/master

Update README with DB documentation
Switched database from Postgres to SQLite

Updated database from Postgres to SQLite so it is easier to get the
application up and running for contributors.

Updated the database.yml file and gemfile