initial attempt at getting post data working. doesn't work yet, but wanted a checkpoint.
read post data (raw) and make a new stream with this data for use by with-program
evaluate cdr of SERVER_SOFTWARE instead of sending back a quoted list
Use "" instead of NIL in CGI environment variables
working on getting content-type right
use tbnl:host and local-addr* instead of acceptor-address as appropriate
remove ignore declaration for content-type
content-type fixes

 * ignore passed in content-type in create-cgi-d-a-h

 * get :content-type header of out tbnl:*request* and pass this to the
cgi script handler
bump version to 0.3 and remove version.lisp-expr