ajp13 connector for tomcat4

[kevin seguin]

as you probably noticed, i checked in my ajp13 connector for tomcat 4.

it's in need of some refactoring (but does work, except for
load-balancing), but i wanted to at least get it checked so others will
have access to it.

there are some (minimal) instructions for using this connector in
jakarta-tomcat-connectors/jk/README.txt.