Added Chapter 1 draft #1 PDF.
Chapter 2 corrections to draft #2, now to draft #3.
Paul Beame corrections to Chapter 2.
Added section numbering for theorems.
Finished adding penultimate Chapter 3 corrections.
Changed alternate to alternative in most cases.
Maybe also fixed Toffoli and CNOT and other gate names to be Roman.
Added \eta symbol for compiling precision.