RFC 1035 (BIND) zone file lexer

It would be great to have a lexer for RFC 1035 / BIND zone files.

Some work was done a few years ago by @pklaus: pklaus/pygments-bind9:dde23d69406c1ae85a7de466f30e4beccf3e7026

Well, I didn't get far. This was my only commit: https://bitbucket.org/pklaus/pygments-bind9/commits/dde23d69406c1ae85a7de466f30e4beccf3e7026

But I still think such a lexer would be valuable.