Merge pull request #4933 from jdfreder/widget-model-name

Small Widget inconsistency fixes

IPython/html/static/notebook/js/widgetmanager.js

@@ -23,7 +23,7 b''
     // elsewhere.
     define(["underscore",
              "backbone",
-            ], function (Underscore, Backbone) {
+            ], function (_, Backbone) {
 
         //--------------------------------------------------------------------
         // WidgetManager class

IPython/html/static/notebook/js/widgets/widget.js

@@ -17,7 +17,7 b''
 define(["notebook/js/widgetmanager",
         "underscore",
         "backbone"], 
-function(WidgetManager, Underscore, Backbone){
+function(WidgetManager, _, Backbone){
 
     var WidgetModel = Backbone.Model.extend({
         constructor: function (widget_manager, model_id, comm) {

IPython/html/widgets/widget.py

@@ -79,7 +79,7 b' class Widget(LoggingConfigurable):'
     #-------------------------------------------------------------------------
     # Traits
     #-------------------------------------------------------------------------
-    model_name = Unicode('WidgetModel', help="""Name of the backbone model 
+    _model_name = Unicode('WidgetModel', help="""Name of the backbone model 
         registered in the front-end to create and sync this widget with.""")
     _view_name = Unicode(help="""Default view registered in the front-end
         to use to represent the widget.""", sync=True)
@@ -121,7 +121,7 b' class Widget(LoggingConfigurable):'
         If a Comm doesn't exist yet, a Comm will be created automagically."""
         if self._comm is None:
             # Create a comm.
-            self._comm = Comm(target_name=self.model_name)
+            self._comm = Comm(target_name=self._model_name)
             self._comm.on_msg(self._handle_msg)
             self._comm.on_close(self._close)
             Widget.widgets[self.model_id] = self