Add Hash util and split out file helper.

lib/common/uglify.options.js

@@ -1,4 +1,11 @@
-module.exports = {
+'use strict';
+
+var util = require('./util'),
+    Hash = util.Hash;
+
+/*----------------------------------------------------------------------------*/
+
+module.exports = new Hash({
   'compress': {
     'pure_getters': true,
     'unsafe': true,
@@ -13,4 +20,4 @@ module.exports = {
     'comments': /^!|@cc_on|@license|@preserve/i,
     'max_line_len': 500
   }
-};
+});