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.
Merge pull request #1974 from jcftang/devel

Integrate upstream changes from Portfile that exists in macports