Use https:// protocol instead of git:// when a proxy is set

[satazor]

People behind proxies simply set the environment variables so that bower sees the proxy. While this works for normal requests, it is not enough for git://. Users have also to configure git to use https.insteadOf.git.

We can do this for github endpoints since they support https. For others we can't do this since https is not supported but we can error out with an appropriate message telling the possible cause for the issue and how to solve it.

http://stackoverflow.com/questions/15669091/bower-install-using-only-https

[pixelheresy]

Went ahead and put together a fix for this. Put in the change early enough in the resolver lifecycle as to not mess with what is going on inside. Check it out.

[satazor]

Fixed by #732