Changed the Git Clone URL so that non-authorized users can clone the repository

Patrick,

When I was following the setup instructions in the README (preparing for our training session on Monday),
I was not authorized to 'git clone' the 'git@...' URL given in the README. 
You can replicate the issue by temporarily moving your SSH private key and attempting the clone.

This pull request changes the URL to an HTTPS URL, which is allowed without authorization.

I am composing this late in the day on a Friday, so I'm not sure if I'm making sense, but let me know if you have any questions.

I'm looking forward to the training at the web conference on Monday.

Thanks,

- Edward