[vim keymap] Implement vim style search

demo/vim.html

@@ -5,7 +5,6 @@
     <title>CodeMirror: Vim bindings demo</title>
     <link rel="stylesheet" href="../lib/codemirror.css">
     <script src="../lib/codemirror.js"></script>
-    <script src="../lib/util/continuecomment.js"></script>
     <script src="../lib/util/dialog.js"></script>
     <script src="../lib/util/searchcursor.js"></script>
     <script src="../mode/clike/clike.js"></script>