LICENSE: add Apache 2.0 license

Squashed commit of the following:

commit b2c340c5b4f05f9360c56da95227ba45fb4920e8
Author: Brandon Philips <brandon@ifup.co>
Date:   Wed Jun 5 10:01:23 2013 -0700

    LICENSE: add Apache 2.0 license

    Assuming that this should be Apache 2.0 since the Google App Engine
    SDK is Apache 2.0.

Closes #11