Support for plain tarballs

[dannytrigo]

I would like to support downloading Puppet module tarballs from plain HTTP URLs, not just from Puppet Forge. For example:
mod "mymodule", :tarball => "http://puppetrepo/me-mymodule-1.0.13.tar.gz"

I find it strange that this doesn't already exist when it is already possible to download tarballs from github. Is there a reason for it not already existing, or it simply needs implementing?