Added support for packages from any URL

This is a preview. I think adding artifactory support might be better than just raw http support. This basically lets you use a url instead of a package name in the create command and downloads that file and then unzips it and runs the lazybones script if there is one.  I don't have an integration spec yet but the existing specs still pass.

:warning: for review and discussion, probably not ready to be merged yet.