Initial checkin for libevent book; mostly example code.
Revise examples to limit buffer size.

Adrian says it's dumb to let hostile input grow your buffers
arbitrarily long, and he's right.  Also, drop some debugging code from
the libevent example.
Here, have a .gitignore file
Make the Makefile work.  add html to gitignore
Add a count-words-or-lines target
Add notes of libevent code that needs to be improved.
First draft of chapter 1
New sections, both empty
Use fd_set, not struct fd_set: the former is standard.
Make it work for people not named nickm
fix example to stop using old var name
stub copyright statement (test commit)
Insert a license file and start writing the reference manual
Insert license boilerplate in existing texts.
Document loop-exit functions.
Add proper incantations to get correct, highlighted source in 01_intro
Add proper incantations to get correct, highlighted source in everything else
Initial editing pass from Susan.

Here, have some grammar and spelling.  Try making sense, too.
Cleanups on cleanups
delete trailing whitespace