Update: Include a CentOS 6 suite

Also changed private IP. 33.33.33.10 is a publically routable address,
and not RFC 1918 compliant.  Don't use it.  Instead select an IP from
one of the three permitted ranges: 10.0.0.0/8, 172.16.0.0/12, or
192.168.0.0/16.
Update: Provide url and checksum hashes for CentOS

In order to test on CentOS 6 I needed to change the hard-coded
URL and checksum.  This is now handled by a hash in the default
attributes, keyed on distro version, which is calculated from
ohai data.
Add: Support https for Gitlab

If the external URL is set to https://, the _openssl recipe will
be included, which creates self-signed certs for the external URL
using the openssl_x509 LWRP.
Update metadata and bump version.
Fix: Use node attributes for SSL cert
Bumb version
Fix: Error in attributes

Forgot to include the ssl key in the hash.