Add CGI wrapper script

Add a very basic wrapper script to make a shell-dancer website runnable
through Apache's mod_cgi.

It doesn't really support much, except dispatching content and saying
"404" when somebody requests a URL without a registered handler.

Additionally, make test.sh quiet by default.
Bugfix: change ROUTES_${method} variable append

For some reason, the original statement adding the route to the list of
known routes for a method fails when registering a /, /hi and /test URL
for example.  This fixes it for now, even though this is made of pure
black magic.