Finished Intro to Knitr.  Switched to Intro to git.
Flushed out Intro to git.

Still rough in places, but much closer.
Final changes to Intro to Git

The presentation will never be done, but it's at least presentable
now.  Small corrections to git_hooks and outline.org as well.
Final updates to presentations.

Populated recap slides and animated points where appropriate/possible.
Cleaned up code for examples 1-5