issue cocos2d#1108: add two method cleanScript and restart

Author: jianglong0156

CCBoot.js

@@ -1673,6 +1673,17 @@ cc._initSys = function (config, CONFIG_KEY) {
         // N/A in cocos2d-html5
     };
 
+    /**
+     * cleanScript the singal JS file
+     * @memberof cc.sys
+     * @name cleanScript
+     * @param {String} jsfile
+     * @function
+     */
+    sys.cleanScript = function (jsfile) {
+        // N/A in cocos2d-html5
+    };
+
     /**
      * Dump system informations
      * @memberof cc.sys
@@ -2034,6 +2045,13 @@ cc.game = /** @lends cc.game# */{
         self._paused = false;
     },
 
+    /**
+     * Run game.
+     */
+    restart: function () {
+        window.location.href = window.location.href;
+    },
+
     /**
      * Run game.
      */