Added sociaml-facebook-api (was facebook-sdk) version 0.4.0

I've renamed the facebook-sdk package to sociaml-facebook-api so that it matches some of the other social networking libraries I'm working on.  I wasn't sure of the procedure for renames so I've left the old facebook-sdk packages 'as-is' for now but if I need to do anything let me know.  Requires Cohttp 0.12.0+