Default to https instead of git protocol for dependencies.

If a company is behind a firewall that doesn't permit git, or they don't have SSH set up yet, they'll have to hunt down this guy:
http://stackoverflow.com/questions/15669091/bower-install-using-only-https/15684898#15684898

Bower may be protocol agnostic, but seems like a best practice is to link to https.
Merge pull request #227 from gwezerek/master

Default to https instead of git protocol for dependencies.