docs(guide): build and test markdown files in doc directory

doc/guide/server.md

@@ -0,0 +1,30 @@
+% Server Guide
+
+## The `Handler`
+
+```ignore,no_run
+extern crate hyper;
+use hyper::server::{Handler, Request, Response, Decoder, Encoder, Next, HttpStream as Http};
+
+struct Hello;
+
+impl Handler<Http> for Hello {
+    fn on_request(&mut self, req: Request<Http>) -> Next {
+
+    }
+
+    fn on_request_readable(&mut self, decoder: &mut Decoder<Http>) -> Next {
+
+    }
+
+    fn on_response(&mut self, res: &mut Response) -> Next {
+
+    }
+
+    fn on_response_writable(&mut self, encoder: &mut Encoder<Http>) -> Next {
+
+    }
+}
+
+# fn main() {}
+```