Add LaTeX cruft to ignore list
Add LaTeX lecture notes

Dumps LaTeX versions of my 674 lecture notes; they still need a lot of
proofreading and refactoring, but they compile into a single pdf using
XeLaTeX.  One nice feature is that the source is in unicode, so the source
is pretty readable on its own.
Update README

Updates the project description in the readme file to include
- lists of the chapter names
- build instructions
Bump version number