Added vendor/ directory for Composer's installed files

vendor/illuminate/contracts/Support/Jsonable.php

@@ -0,0 +1,13 @@
+<?php namespace Illuminate\Contracts\Support;
+
+interface Jsonable {
+
+	/**
+	 * Convert the object to its JSON representation.
+	 *
+	 * @param  int  $options
+	 * @return string
+	 */
+	public function toJson($options = 0);
+
+}