[cgiapp] test namespace for CGI::Application

[Alex]

Dear all!

I recently polluated another cpan root namespace by including a test
application in a dist. That's bad. I wonder if there isn't a test namespace
in the CGI::Application namespace itself. So anyone releasing a plugin with
a test application could use this namespace.

CGI::Application::TestApps is what I was thinking of.
What do you think of this?

Regards, Alex