move 'is' method to the str class where it belongs.

laravel/routing/route.php

@@ -1,6 +1,7 @@
 <?php namespace Laravel\Routing;
 
 use Closure;
+use Laravel\Str;
 use Laravel\URI;
 use Laravel\Bundle;
 use Laravel\Request;
@@ -198,7 +199,7 @@ class Route {
 		// if they match we'll attach the filter.
 		foreach (Filter::$patterns as $pattern => $filter)
 		{
-			if (URI::is($pattern, $this->uri))
+			if (Str::is($pattern, $this->uri))
 			{
 				$filters[] = $filter;
 			}