add Reconnect to kernel menu

IPython/html/static/notebook/js/menubar.js

@@ -295,6 +295,9 @@ define([
         this.element.find('#restart_kernel').click(function () {
             that.notebook.restart_kernel();
         });
+        this.element.find('#reconnect_kernel').click(function () {
+            that.notebook.kernel.reconnect();
+        });
         // Help
         if (this.tour) {
             this.element.find('#notebook_tour').click(function () {

IPython/html/templates/notebook.html

@@ -230,10 +230,16 @@ class="notebook_app"
                     <ul id="kernel_menu" class="dropdown-menu">
                         <li id="int_kernel"
                             title="Send KeyboardInterrupt (CTRL-C) to the Kernel">
-                            <a href="#">Interrupt</a></li>
+                            <a href="#">Interrupt</a>
+                        </li>
                         <li id="restart_kernel"
                             title="Restart the Kernel">
-                            <a href="#">Restart</a></li>
+                            <a href="#">Restart</a>
+                        </li>
+                        <li id="reconnect_kernel"
+                            title="Reconnect to the Kernel">
+                            <a href="#">Reconnect</a>
+                        </li>
                         <li class="divider"></li>
                         <li id="menu-change-kernel" class="dropdown-submenu">
                             <a href="#">Change kernel</a>