use the 'singleton' construction idiom rather than classical constructors for

creating the bookmarks, history, commandline, search, previewwindow,
bufferwindow, statusline, buffer, editor, marks and quickmarks objects

content/completion.js

@@ -610,7 +610,7 @@ vimperator.Completion = function () // {{{
             return [start, completions];
         } //}}}
 
-    }
+    };
 } // }}}
 
 // vim: set fdm=marker sw=4 ts=4 et: