Adds section 2 and 3 for the fog SDK for FirstApp tutorial, as well as fixes the repo that the faafo is cloned from in section 1. Co-Author: Caleb Boylan <calebboylan@gmail.com> Co-Author: Tom Fifield <tom@openstack.org> Partial-Bug: #1449329 Change-Id: I553af22e904261d3465eda4301a664d24fe91b31