Cleanup 2011-2012fall boundary.
Rewording the git presentation for a live demo.

For now, only TODOs, need to add images, more words, a longer task, etc.
[git]: Still only some ideas and TODOs
[git] Added to presentation
[git]: finish 2011-autumn presentation
[git]: Contribution by RD (new slides and feedback)
[git]: Finished presentation
Cleanup repo @2009-2010 boundary.
Done
[git]: finish 2011-autumn presentation
Add base headers and interfaces for 2013 application task