Added the $ORIGIN directive

[oliverisaac]

The $ORIGIN directive is expected by some BIND file parsers.

From http://www.zytrax.com/books/dns/ch8/origin.html :

$ORIGIN defines a base name from which 'unqualified' names (those without a terminating dot) substitutions are made when processing the zone file. Zone files which do not contain an $ORIGIN directive, while being perfectly legitimate, can also be highly confusing. In general, always explicitly define an $ORIGIN directive unless there is a very good reason not to (sloth is not a very good reason).