Improved autoloader to not raise an error on non-existent files

Author: thomasbachem

src/autoload.php

@@ -10,7 +10,9 @@
 
 	$classPath = strtr(substr($className, strlen('UnitedPrototype')), '\\', '/') . '.php';
 
-	require(__DIR__ . $classPath);
+	if(file_exists(__DIR__ . $classPath)) {
+		require(__DIR__ . $classPath);
+	}
 });
 
 ?>