Moving to a simple make file for building the pdf

Moving to make instead of the custom bash script for building the pdf. It's overkill here, but this seemed like an easy way to try it for the first time. This can be run from any *nix environment by simply typing ``make``.

If you're using msysgit (aka GitBash) you may need to add make to your system (http://stackoverflow.com/questions/3219926/using-make-with-msysgit).