Adding filter() method to Klein to use for middleware such as Auth

.gitignore

@@ -2,6 +2,9 @@
 composer.lock
 vendor/
 
+# Mac OS
+.DS_Store
+
 # Auto-generated documentation directory (phpDocumentor)
 docs/
 

src/Klein/Klein.php

@@ -341,6 +341,44 @@ public function respond($method, $path = '*', $callback = null)
         return $route;
     }
 
+    /**
+     * Middleware alternative for respond() that doesn't count as a
+     * matched route.
+     *
+     * <code>
+     * $router = new Klein();
+     *
+     * $router->filter( function() {
+     *     echo 'this works';
+     * });
+     * $router->filter( '/endpoint', function() {
+     *     echo 'this also works';
+     * });
+     * $router->filter( 'POST', '/endpoint', function() {
+     *     echo 'this also works!!!!';
+     * });
+     * </code>
+     *
+     * @param string $method
+     * @param string $path
+     * @param callable $callback
+     * @return Route
+     */
+    public function filter($method, $path = '*', $callback = null)
+    {
+        // Get the arguments in a very loose format
+        extract(
+            $this->parseLooseArgumentOrder(func_get_args()),
+            EXTR_OVERWRITE
+        );
+
+        $route = $this->route_factory->build($callback, $path, $method, false);
+
+        $this->routes->add($route);
+
+        return $route;
+    }
+
     /**
      * Collect a set of routes under a common namespace
      *

src/Klein/RouteFactory.php

@@ -128,7 +128,7 @@ public function build($callback, $path = null, $method = null, $count_match = tr
             $callback,
             $this->preprocessPathString($path),
             $method,
-            $this->shouldPathStringCauseRouteMatch($path) // Ignore the $count_match boolean that they passed
+            ($this->shouldPathStringCauseRouteMatch($path) && $count_match) // actually pass in the count_match flag
         );
     }
 }