Update Readme to provide instructions for Enabling CORS on S3 buckets.
Squashed commit of the following:

commit afdd585db0e502c5513f2250563756ffa55253c3
Author: Brian Gonzalez <me@briangonzalez.org>
Date:   Sun Dec 15 15:12:35 2013 -0800

    issue #6 - cleaned up readme