HTTP is a more behind-the-firewall accessible protocol than git://

* Performance of HTTP protocol for Git repos is on part with that of git://
* HTTP is preferred over git:// for accessibility
* HTTP can more often be used even with corporate firewalls and proxy servers
* HTTP is the documented default about half-way down the Node guide at https://www.npmjs.org/doc/files/package.json.html
Merge pull request #37 from matthewmccullough/http-repository-protocol

HTTP is a more behind-the-firewall accessible protocol than git://