Merge pull request #3368 from samuela/master

Reenable bracket matching in CodeMirror. 

Upstream code was moved in a add-on, just load this add-on, configuration was still in the right place.

IPython/frontend/html/notebook/templates/notebook.html

@@ -196,6 +196,7 @@ class="notebook_app"
 <script src="{{ static_url("components/codemirror/addon/mode/loadmode.js") }}" charset="utf-8"></script>
 <script src="{{ static_url("components/codemirror/addon/mode/multiplex.js") }}" charset="utf-8"></script>
 <script src="{{ static_url("components/codemirror/addon/mode/overlay.js") }}" charset="utf-8"></script>
+<script src="{{ static_url("components/codemirror/addon/edit/matchbrackets.js") }}" charset="utf-8"></script>
 <script src="{{ static_url("notebook/js/codemirror-ipython.js") }}" charset="utf-8"></script>
 <script src="{{ static_url("components/codemirror/mode/htmlmixed/htmlmixed.js") }}" charset="utf-8"></script>
 <script src="{{ static_url("components/codemirror/mode/xml/xml.js") }}" charset="utf-8"></script>