Integrate upstream changes from Portfile that exists in macports

See this post - https://groups.google.com/forum/?fromgroups=#!topic/ansible-project/7xdC0MP9MjM

I was not aware that blair had uploaded a portfile to macports already,
this set of changes makes the 'devel' version of the portfile similar
to the upstream. Except the man pages, examples and sample config files are installed.