Add libblas, libatlas, liblapack. Upgrade to 13.10

Added libblas-dev, libatlas-dev, liblapack-dev, and gfortran to packages.txt for compatibility with python packages numpy, scipy, and scikit-learn.
Upgraded to Dockerfile to use Ubuntu 13.10 (saucy) from stackbrew/ubuntu repository.
Changed maintainer in Dockerfile to Al Johri.
Renamed docker image to aljohri/buildstep.
Remove update-alternatives for ruby and gem.