Maxima

I have included support for Maxima (file extension .mac) and provided a short sample (copied from my Apache 2.0 licenced project, so no (c) issues are present). More info in files' and commit comments.

BTW, if you wonder what Maxima is. It's an open source computer algebra system, similar to Mathematica or Maple. http://maxima.sourceforge.net/

Best regards, Jernej Kovacic