Progress: work on http request processing, path processing, and other fixes

Progress: work on http request processing, path processing, and other fixes

Process the HTTP request methods, such as GET, POST, HEAD, OPTIONS, etc...
Add validation against these request methods on a per path basis.

Improve path processing logic (there is still more work to do).

Other fixes and improvements.
I specifically added an nginx example configuration file (it still requires separate PHP-fcgi configuration).