fix #1208 - registerRest/WebInterface should return the router

- to allow method chaining

source/vibe/web/rest.d

@@ -61,7 +61,7 @@ import std.traits;
 		$(D RestInterfaceClient) class for a seamless way to access such a generated API
 
 */
-void registerRestInterface(TImpl)(URLRouter router, TImpl instance, RestInterfaceSettings settings = null)
+URLRouter registerRestInterface(TImpl)(URLRouter router, TImpl instance, RestInterfaceSettings settings = null)
 {
 	import std.traits : InterfacesTuple;
 	import vibe.internal.meta.uda : findFirstUDA;
@@ -154,23 +154,24 @@ void registerRestInterface(TImpl)(URLRouter router, TImpl instance, RestInterfac
 			}
 		}
 	}
+	return router;
 }
 
 /// ditto
-void registerRestInterface(TImpl)(URLRouter router, TImpl instance, MethodStyle style)
+URLRouter registerRestInterface(TImpl)(URLRouter router, TImpl instance, MethodStyle style)
 {
-	registerRestInterface(router, instance, "/", style);
+	return registerRestInterface(router, instance, "/", style);
 }
 
 /// ditto
-void registerRestInterface(TImpl)(URLRouter router, TImpl instance, string url_prefix,
+URLRouter registerRestInterface(TImpl)(URLRouter router, TImpl instance, string url_prefix,
 	MethodStyle style = MethodStyle.lowerUnderscored)
 {
 	auto settings = new RestInterfaceSettings;
 	if (!url_prefix.startsWith("/")) url_prefix = "/"~url_prefix;
 	settings.baseURL = URL("http://127.0.0.1"~url_prefix);
 	settings.methodStyle = style;
-	registerRestInterface(router, instance, settings);
+	return registerRestInterface(router, instance, settings);
 }
 
 
@@ -240,8 +241,8 @@ unittest
 	{
 		import vibe.http.server, vibe.http.router;
 
-		auto router = new URLRouter();
-		registerRestInterface(router, new API());
+		auto router = new URLRouter;
+		router.registerRestInterface(new API());
 		listenHTTP(new HTTPServerSettings(), router);
 	}
 }

source/vibe/web/web.d

@@ -130,15 +130,15 @@ import vibe.http.websockets;
 		$(D @vibe.web.common.contentType)
 
 		The `@path` attribute can also be applied to the class itself, in which
-		case it will be used as an additional prefix to the one in 
+		case it will be used as an additional prefix to the one in
 		`WebInterfaceSettings.urlPrefix`.
 
 	Params:
 		router = The HTTP router to register to
 		instance = Class instance to use for the web interface mapping
 		settings = Optional parameter to customize the mapping process
 */
-void registerWebInterface(C : Object, MethodStyle method_style = MethodStyle.lowerUnderscored)(URLRouter router, C instance, WebInterfaceSettings settings = null)
+URLRouter registerWebInterface(C : Object, MethodStyle method_style = MethodStyle.lowerUnderscored)(URLRouter router, C instance, WebInterfaceSettings settings = null)
 {
 	import std.algorithm : endsWith;
 	import std.traits;
@@ -194,6 +194,7 @@ void registerWebInterface(C : Object, MethodStyle method_style = MethodStyle.low
 			}
 		}
 	}
+	return router;
 }