Adding SSL support for apache2 vhost

Here's my attempt at adding SSL support for #49.  Hopefully I was on the right track with the test-kitchen stuff.  It was my first exposure to it so if there is a better pattern I should follow let me know and I'll change it around.  I needed to add a test cookbook in in order to add the cert and key files prior to running the graphite recipe, otherwise apache would choke.

I verified that the test-kitchen run completed successfully (excluding the centos-58 VM that I couldn't get to converge successfully prior to these updates).