Comprehensive HTTP Router

Here is a partial solution to Issue #202, at least for different HTTP methods.  There is no provision for websocket or SSE support here.  This is more or less a port of the excellent Vert.x RouteMatcher for RxNetty.  I do want to point out that I had to force queryParameters to be mutable on HttpRequest for this particular implementation.
Isn't this mixing the URI parsing and routing? I think we should separate it and provide it as a utility if someone wants to extract path fragments from a URI. Adding path fragments as query parameters does not sound correct to me.