New "alpha" MMD features

I added the following to the MMD github repository:

  
1. the beamer.xslt file - create use the LaTeX beamer class to generate PDF slideshows from MMD files. Supported metadata includes:

   Title
  Subtitle
  author
  Affiliation
  theme (uses a beamer-theme)
  graphic (use a graphic as a logo)

   Full docs are pending (I hope), but experiment. h1 is a part and lists an outline, h2 is section, h3 subsection, h4 slide, h5 is only displayed in handout version

 2. I have started an XSLT to convert HTML to RTF. This is **really** basic and not ready for prime time. It needs work. It needs input from other people. I will probably not finish this on my own. Use the mmd2rtf.pl command to access this, rather than the multimarkdown2rtf.pl (which still uses apple's textutil)

  
Check it out!