add vars into router

router.go

 		Fatalf("Failed to start the server: %v", err)
 	}
 }
+
+// Vars returns the route variables for the current request, if any.
+func (self *Router) Vars(r *http.Request) map[string]string {
+	return mux.Vars(r)
+}

router_test.go

 		So(response.Header().Get("Content-Type"), ShouldEqual, "application/json")
 	})
 }
+
+func TestVars(t *testing.T) {
+	Convey("rex.Vars", t, func() {
+		app := New()
+		app.Get("/users/{id}", func(w http.ResponseWriter, r *http.Request) {
+			vars := app.Vars(r)
+			So(vars["id"], ShouldEqual, "123")
+		})
+
+		request, _ := http.NewRequest("GET", "/users/123", nil)
+		response := httptest.NewRecorder()
+		app.ServeHTTP(response, request)
+	})
+}

utils.go

 package rex
-
-import (
-	"net/http"
-
-	"github.com/gorilla/mux"
-)
-
-// Vars returns the route variables for the current request, if any.
-func Vars(r *http.Request) map[string]string {
-	return mux.Vars(r)
-}