Docs for Official Repo release

Changes and additions for the Official Repo release on Wednesday.
This is trying to explain that if you have `RUN apt-get update && apt-get update -y s3cmd=1.0.0*` and change it to `RUN apt-get update && apt-get update -y s3cmd=1.1.0*` the docker cache busts and causes a automatic cache bust of `apt-get update` (ensuring that the newly specified version of your wanted package is there in the apt cache).