Validate slider value, when limits change
The value of slider changes in frontend, and readout, but not in python obj.
Sending data back to python object after slider values change
A comma after `this.touch`
Embrace flexible box model
Added baseline and stretch
Renamed *Widget to *,
depracted old names.
Fix interact tests for rename
adding hbox and vbox

Conflicts:
	IPython/html/static/widgets/js/widget_container.js
	IPython/html/widgets/widget_container.py
Make HBox and VBox helper functions
Added some doc strings on the widgets.
Also address the comments Matthias left me.
Added incompat for name deprecation.
Rebase cleanup
Automatically open a comm on creation of widgets

This will immediately create a model on the javascript side when a widget is created.  This means that, for example, a widget that only interacts with its model can work without "displaying" it.
Don't register comm with comm_manager if comm_manager is undefined
Check for null session in _publish_msg and _session)default
Make the widget comm attribute more straigtforward

Instead of automagically instantiating a comm when it is accessed, require a call to open().  This makes the comm attribute much less magical, and hopefully more understandable.
allowing widet id to be set externally
s/Container/Box
Added comment about box rename.