added option to install with support for the docker module

added docker-py dependency (used by docker modules that is now part of the core)
activate docker-py resource
docker option
I asked on the `ansible` IRC channel and no one knew how to generate a list (although I cannot believe this is impossible - but I am just no python guy). As it stands right now: On every release we would have to go check all modules and update all links and sha's manually. And the list of modules is loooong http://docs.ansible.com/list_of_all_modules.html