Add an nginx docker image for use on the master.

cluster/images/nginx/Dockerfile

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+FROM google/debian:wheezy
+
+COPY backports.list /etc/apt/sources.list.d/backports.list
+
+RUN apt-get update
+RUN apt-get -t wheezy-backports -yy -q install nginx

cluster/images/nginx/Makefile

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+### Nginx image
+# This image is used to run nginx on the master.
+
+# Current 'live' version is v1
+# Please make sure that you update this comment if you build/push new
+# versions.
+VERSION=v2
+
+all:
+	docker build -t gcr.io/google_containers/nginx:${VERSION} .
+	gcloud preview docker push gcr.io/google_containers/nginx:${VERSION}
+
+.PHONY: all
+

cluster/images/nginx/README.md

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+### Nginx image
+This image is used to run nginx on the master.
+
+#### Instructions
+make
+
+

cluster/images/nginx/backports.list

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+deb http://gce_debian_mirror.storage.googleapis.com wheezy-backports main non-free