Set the group on the private key directory.

Set the group of the private key directory to ssl-cert. Also set the
mode to 0750 so that users of the group ssl-cert have access to keys.
Add the 'ssl-cert' group
This module depends on the group but it's not created automatically
Quote 'present' properly
Merge pull request #4 from danieldreier/add_ssl_group_to_ssl_group

Add the 'ssl-cert' group
Add defined type to deploy certs
Generate the combined files nginx and haproxy prefer
Update README with ssl::cert instructions
Merge pull request #6 from danieldreier/add_cert_defined_type

Add cert defined type