Made the Ajax request itself also use the &_= trick for Safari

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@968 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_view/helpers/javascripts/prototype.js

@@ -154,7 +154,7 @@ Ajax.Request.prototype = (new Ajax.Base()).extend({
           'application/x-www-form-urlencoded');
       }
       
-      this.transport.send(this.options.parameters);
+      this.transport.send(this.options.method == 'post' ? this.options.parameters + '&_=' : null);
                       
     } catch (e) {
     }