Reply to queries when you have a wildcard in the zone. This works
for DNS and DNSSEC. Thing missing is NODATA responses for that specific
wildcard.

Add wildcard_test.go as well.

Get positive dnssec stuff going

Add canonical sorting

Add a low-allocation canonical sorting function that can be used in
middleware.

This implements the tests from rfc4034 correctly.

Transfer out

These can be enabled by adding "transfer out" to the Corefile. Without
it no AXFR is allowed.

For now only AXFR and no IXFR. No TSIG and no ACLs.

Add testing package

This already includes a bunch of helper functions that aid in testing.
Factor out etcd and file testing to use this package.

Fixes: #50

Etcd stub

Zonefile fix

Full implementation, DNS (and in the future DNSSEC). Returns answer in a
hopefully standards compliant way.
Testing with my miek.nl zone are included as well.
This should correctly handle nodata, nxdomain and cnames.

This implements stubzones in the same way as SkyDNS. This
also works with multiple configured domains and has tests.
Also add more configuration parameters for TLS and path prefix and
enabling stubzones.  Run StubUpdates as a startup command to keep up to
date with the list in etcd.

Cname ordering

Add a test for SkyDNS':
https://github.com/skynetservices/skydns/issues/217

Put the CNAME in front for both answer and extra sections. Note that
the etcd middleware seems to already to the correct thing though.

Add Scrub function

This function will make the message fit for the client's buffer, or
set the TC bit.

Add state.SizeAndDo()