Fixed typo, removed obselete author's note.
Work on animations.

Experimented with adding animations to the book. Also, fixed
the H-Infinity code a bit to more close reflect Simon's code.
Improved discussion of Fox and Thrun.
Added discrete Wiener process Acceleration model.

Got rid of the hand-wavey 'Q is hard' text and put in a discrete
Wiener process Acceleration model for Q.