Play Connect 4!

Grab a friend and enjoy a fun round of Connect 4!

![screen shot 2014-09-28 at 10 49 18 am](https://cloud.githubusercontent.com/assets/7933929/4434622/b7ccd51e-471e-11e4-9f2c-7bbdc694677d.png)


Good job figuring out `require_relative`