Half way through preparing presentation for group meeting.
Most of the content is included.
Use pygments to augment pandoc code highlighting for console blocks.

build_slides.py script converts .console blocks to html with an
intermediate md file.
Close to final version of talk.
Close to final version of talk.

 * Clean up tmp files with build_slides.py

 * Add API slide

 * Add "dog food" with picture of Andrew.
Fix typo
Improve API slide.