Add modelines and reformat pp files
Add bind::updater class

Create a bind::updater class to add support for the dns_rr resource on systems
that will not have a BIND server installed or running.
Fix up bind::updater and support rndc

I thought I fixed rndc a while ago... not quite. Do it now. Make bind::updater
actually work (incomplete last time)
Release version 2.1.0

* Support updates from nodes that don't run bind (closes #2)
* Fix rndc once and for all
* Some minor style fixes