Update example app to include a loadbalancer.

experimental/example/frontend/Dockerfile

@@ -0,0 +1,11 @@
+FROM ubuntu
+MAINTAINER Weaveworks Inc <help@weave.works>
+RUN apt-get update && \
+  apt-get install -y nginx && \
+  rm -rf /var/lib/apt/lists/*
+RUN rm /etc/nginx/sites-available/default && \
+  ln -sf /dev/stdout /var/log/nginx/access.log && \
+  ln -sf /dev/stderr /var/log/nginx/error.log
+COPY default.conf /etc/nginx/conf.d/
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]