Add arbitrary filesystem resource overlays in build

Shane

2016-03-11 4f9f613b4ef50504576c9422009e947eeb523e6d

 Dockerfile

@@ -77,5 +77,11 @@
      done; \
    fi

# Overlay files and directories in resources/overlays if they exist
RUN rm /tmp/resources/overlays/README.txt && \
    if ls /tmp/resources/overlays/* > /dev/null 2>&1; then \
      cp -rf /tmp/resources/overlays/* /; \
    fi;

# Delete resources after installation
RUN rm -rf /tmp/resources