Add pdns resolver, changed some other files

data/Dockerfiles/pdns/Dockerfile

@@ -0,0 +1,18 @@
+FROM debian:jessie
+MAINTAINER Andre Peters <andre.peters@debinux.de>
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN echo 'deb http://repo.powerdns.com/debian jessie-rec-40 main' > /etc/apt/sources.list.d/pdns.list
+
+RUN echo 'Package: pdns-*\n\
+Pin: origin repo.powerdns.com\n\
+Pin-Priority: 600\n' > /etc/apt/preferences.d/pdns
+
+RUN apt-key adv --fetch-keys http://repo.powerdns.com/FD380FBB-pub.asc \
+	&& apt-get update \
+	&& apt-get install -y --force-yes pdns-recursor
+
+CMD ["/usr/sbin/pdns_recursor"]
+
+EXPOSE 53/udp