Dockerfile: Initial commit

* First attempt at a minimal Dockerfile.  Will need testing.

Dockerfile

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+#
+# Minimum Docker image to build Android AOSP
+#
+FROM ubuntu:14.04
+
+MAINTAINER Kyle Manna <kyle@kylemanna.com>
+
+# Keep the dependency list as short as reasonable
+RUN apt-get update && \
+    apt-get install -y bison bsdmainutils build-essential curl \
+        flex g++-multilib gcc-multilib git gnupg gperf lib32ncurses5-dev \
+        lib32readline-gplv2-dev lib32z1-dev libesd0-dev libncurses5-dev \
+        libsdl1.2-dev libwxgtk2.8-dev libxml2-utils lzop openjdk-6-jdk \
+        pngcrush schedtool xsltproc zip zlib1g-dev && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ADD https://commondatastorage.googleapis.com/git-repo-downloads/repo /usr/local/bin/
+RUN chmod 755 /usr/local/bin/*
+
+# All builds will be done by user aosp
+RUN useradd --create-home aosp
+
+# The persistent data will be in these two directories, everything else is
+# considered to be ephemeral
+VOLUME /tmp/ccache
+VOLUME /aosp
+
+# Improve rebuild performance by enabling compiler cache
+ENV USE_CCACHE 1
+ENV CCACHE /tmp/ccache
+
+# Work in the build directory, repo is expected to be init'd here
+USER aosp
+WORKDIR /aosp