renamed Route::handler to Route::f, added Route::h to register Handler

src/route.rs

@@ -227,6 +227,27 @@ impl<S, R, F> RouteHandler<S> for AsyncHandler<S, R, F>
 }
 
 
+/// Json response helper
+///
+/// The `Json` type allows you to respond with well-formed JSON data: simply return a value of
+/// type Json<T> where T is the type of a structure to serialize into *JSON*. The
+/// type `T` must implement the `Serialize` trait from *serde*.
+///
+/// ```rust
+/// # extern crate actix_web;
+/// # #[macro_use] extern crate serde_derive;
+/// # use actix_web::*;
+/// # 
+/// #[derive(Serialize)]
+/// struct MyObj {
+///     name: String,
+/// }
+///
+/// fn index(req: HttpRequest) -> Result<Json<MyObj>> {
+///     Ok(Json(MyObj{name: req.match_info().query("name")?}))
+/// }
+/// # fn main() {}
+/// ```
 pub struct Json<T: Serialize> (pub T);
 
 impl<T: Serialize> FromRequest for Json<T> {