Implement a DNS zone

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.

middleware/file/file.md

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+# file
+
+`file` enabled reading zone data from a RFC-1035 styled file.
+
+The etcd middleware makes extensive use of the proxy middleware to forward and query
+other servers in the network.
+
+## Syntax
+
+~~~
+file dbfile [zones...]
+~~~
+
+* `dbfile` the database file to read and parse.
+* `zones` zones it should be authoritative for. If empty the zones from the configuration block
+    are used.
+
+If you want to `round robin` A and AAAA responses look at the `loadbalance` middleware.
+
+~~~
+file {
+    db <dsds>
+    masters [...masters...]
+}
+~~~
+
+
+
+
+
+* `path` /skydns
+* `endpoint` endpoints...
+* `stubzones`
+
+## Examples
+
+dnssec {
+    file blaat, transparant allow already signed responses
+    ksk bliep.dsdsk
+}