Add a simple oneliner way to add fallback routes to a scope.

I found I was repeating these same 2 lines in many places. Having
a simple macro for them will make working with routes a bit less
repetitive.

src/Routing/ScopedRouteCollection.php

@@ -626,4 +626,16 @@ public function merge(ScopedRouteCollection $collection) {
 		$this->_named += $collection->named();
 	}
 
+/**
+ * Connect the `/:controller` and `/:controller/:action/*` fallback routes.
+ *
+ * This is a shortcut method for connecting fallback routes in a given scope.
+ *
+ * @return void
+ */
+	public function fallbacks() {
+		$this->connect('/:controller');
+		$this->connect('/:controller/:action/*');
+	}
+
 }

tests/TestCase/Routing/ScopedRouteCollectionTest.php

@@ -379,4 +379,18 @@ public function testResourcesNested() {
 		});
 	}
 
+/**
+ * Test connecting fallback routes.
+ *
+ * @return void
+ */
+	public function testFallbacks() {
+		$routes = new ScopedRouteCollection('/api', ['prefix' => 'api']);
+		$routes->fallbacks();
+
+		$all = $routes->routes();
+		$this->assertEquals('/api/:controller', $all[0]->template);
+		$this->assertEquals('/api/:controller/:action/*', $all[1]->template);
+	}
+
 }