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.
Looks like you are ignoring the result of the route (`RequestHandler.handle()`) call. If no one subscribes to the `RequestHandler.handle()` result, it will never execute.