Dockerfile for ubuntu stable

Add Dockerfile for parity stable branch

docker/ubuntu-stable/Dockerfile

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+FROM ubuntu:14.04
+WORKDIR /build
+# install tools and dependencies
+RUN apt-get update && \
+        apt-get install -y \
+        g++ \
+        curl \
+        git \
+        file \
+        binutils
+
+# install rustup
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
+
+# rustup directory
+ENV PATH /root/.cargo/bin:$PATH
+
+# show backtraces
+ENV RUST_BACKTRACE 1
+
+# show tools
+RUN rustc -vV && \
+cargo -V && \
+gcc -v &&\
+g++ -v
+
+# build parity
+RUN git clone https://github.com/ethcore/parity && \
+        cd parity && \
+        git checkout stable && \
+        git pull && \
+        cargo build --release --verbose && \
+        ls /build/parity/target/release/parity && \
+        strip /build/parity/target/release/parity
+
+RUN file /build/parity/target/release/parity
+
+EXPOSE 8080 8545 8180
+ENTRYPOINT ["/build/parity/target/release/parity"]