Add option to define address mapping in dnsmasq

- 'cname.conf.j2' template has been renamed to 'zone.conf.j2' and will
  be used to configure zone-like information served by dnsmasq;
- you can define 'dnsmasq_address' hash variable with domain->ip address
  mapping (an --address option in dnsmasq);
Merge pull request #79 from drybjed/role/dnsmasq-zone

Add option to define address mapping in dnsmasq