change git gem installs to use http:// instead of git://

I couldn't get the git:// urls to work in my firewalled enterprise that requires an http proxy.  This PR changes the git:// url to http so that it can work through a proxy.

This change is testing essentially the same thing as the git:// use case but with http instead.  Arguably a super set of the git:// test.

Yeti PR forthcoming.