Move enterprise version into this branch (#94)

Since the only difference is mattermost package and  we don't want
to maintain two difference branches, just moved the enterprise version
into a alternative dockerfile

app/Dockerfile-enterprise

@@ -0,0 +1,24 @@
+FROM ubuntu:14.04
+
+ENV PATH="/mattermost/bin:${PATH}"
+
+RUN apt-get update && apt-get -y install curl netcat
+RUN mkdir -p /mattermost/data
+
+ENV MM_VERSION=3.6.2
+
+RUN curl https://releases.mattermost.com/$MM_VERSION/mattermost-$MM_VERSION-linux-amd64.tar.gz | tar -xvz
+
+RUN rm /mattermost/config/config.json
+COPY config.template.json /
+
+COPY docker-entry.sh /
+RUN chmod +x /docker-entry.sh
+ENTRYPOINT ["/docker-entry.sh"]
+
+EXPOSE 80
+
+VOLUME /mattermost/data
+
+WORKDIR /mattermost/bin
+CMD ["platform"]