update to the sameersbn/ubuntu:12.04.20140818 baseimage
removed /var/lib/apt/lists to optimization image size
apt-get clean is now redundant, see https://github.com/docker-library/buildpack-deps/pull/1
use spaces to indent
add -nv (no verbose) option to all wget calls

the -nv option prints a one-line summary of the download on completion and
eliminates the progress bar that clutters up the build log with ANSI escapes