Add ability to use another "ace" function from the directive's input

  attribute
This is useful when using this directive inside a popup window that has
its own "ace" function.

Author: David HAN SZE CHUEN

src/ui-ace.js

@@ -95,11 +95,18 @@ angular.module('ui.ace', [])
          */
         var opts = angular.extend({}, options, scope.$eval(attrs.uiAce));
 
+        /**
+         * ACE library reference
+         * Use our own "ace" reference or use the global one.
+         * @type object
+         */
+        var ace = opts.ace || window.ace;
+
         /**
          * ACE editor
          * @type object
          */
-        var acee = window.ace.edit(elm[0]);
+        var acee = ace.edit(elm[0]);
 
         /**
          * ACE editor session.