Added basic docker support

Dockerfile

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+# This provides a minimal websockify Docker image. The image is based on Alpine
+# edge to be able to benefit from the numpy package that is currently in
+# testing. This ought to change as soon as numpy has qualified out of testing.
+FROM alpine:edge
+MAINTAINER Emmanuel Frecon <efrecon@gmail.com>
+
+RUN apk add --update-cache python && \
+    apk add --update-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted py-numpy && \
+    rm -rf /var/cache/apk/*
+
+COPY run /opt/websockify/
+COPY LICENSE.txt /opt/websockify/
+COPY README.md /opt/websockify/
+COPY websockify/ /opt/websockify/websockify/
+
+# Copy the demo IRC and Telnet servers into /opt/websockify/web
+COPY *.html /opt/websockify/web/
+COPY include/ /opt/websockify/web/include/
+
+# Expose two volumes to (possibly) host configuration files needed on the
+# command line, e.g. keys and certificates for WSS access, files served for
+# --web options, etc.
+VOLUME /opt/websockify/data
+VOLUME /opt/websockify/config
+
+# Expose regular and encrypted standard web ports, you'll have to specify these
+# in the command-line arguments.
+EXPOSE 443
+EXPOSE 80
+
+ENTRYPOINT ["/websockify/run"]