Make : invalid in filenames in the Notebook JS code.

IPython/frontend/html/notebook/static/js/notebook.js

@@ -28,7 +28,7 b' var IPython = (function (IPython) {'
         this.control_key_active = false;
         this.notebook_id = null;
         this.notebook_name = null;
-        this.notebook_name_blacklist_re = /[\/\\]/;
+        this.notebook_name_blacklist_re = /[\/\\:]/;
         this.nbformat = 3 // Increment this when changing the nbformat
         this.style();
         this.create_elements();

IPython/frontend/html/notebook/static/js/savewidget.js

@@ -83,7 +83,7 b' var IPython = (function (IPython) {'
                         $(this).find('h3').html(
                             "Invalid notebook name. Notebook names must "+
                             "have 1 or more characters and can contain any characters " +
-                            "except / and \\. Please enter a new notebook name:"
+                            "except :/\\. Please enter a new notebook name:"
                         );
                     } else {
                         IPython.notebook.set_notebook_name(new_name);