Output full domain then IP to make sorting easier

[ethicalhack3r]

Would be cool if output was:

mail.somedomain.com - 127.0.0.1

Instead of

127.0.0.1 - mail.somedomain.com

So that the list can be sorted easily with tools like sort -u

[rbsec]

Personally I prefer to have the IPs output first to make it easier to group domains/sites that are on the same IP address, so I've left that as the default. However, I've added a --domain-first (-D) option to reverse the output.