Ignore latex auxiliary files
Add example Markdown -> Beamer presentation

See
    * http://jeromyanglim.blogspot.fr/2012/07/beamer-pandoc-markdown.html
    * https://github.com/jeromyanglim/rmarkdown-rmeetup-2012/tree/master/talk
    * http://www.music.mcgill.ca/~sinclair/content/blog/using_markdown_for_beamer_presentations
Add reveal.js template and basic content w/ links

Need https://github.com/hakimel/reveal.js in the overview directory.
Give html extension for syntax highlighting
Open in browser window
Move all overview files to root
Merge master as subdirectory
Mv .gitignore
Add reveal.js submodule
Change submodule URL type

(hopefully fixes build error)
Update template