Copy configure_script.sh script into the container

And adjust README.md which suggested you to fetch it from GitHub at runtime

Signed-off-by: Gianpaolo Macario <gianpaolo_macario@mentor.com>
Merge pull request #65 from gmacario/add-configure-build

Copy configure_script.sh script into the container

Fixes Issue https://github.com/gmacario/easy-build/issues/63