has 'size' => ( is => 'ro', isa => 'Str');
has 'image' => ( is => 'ro', isa => 'Str');
has 'pub_ssh' => ( is => 'ro', isa => 'Str');
+has 'config' => ( is => 'rw', isa => 'HashRef', required => 1 );
has 'provision_backend' => (is => 'rw', isa => 'Str', required => 1, default => 'Oyster::Provision::Rackspace' );
# TODO after provision, add the server's name with "oyster-" prefixed to the