Removed get_kernel method.
remove length test add_class and remove_class
make JS update comment more descriptive (english)
comment model.set, so we know that it triggers update on other views
add locks to update everywhere by using options to pass this
(and check for this)
toggle button, set $el to button (removing extra div)
add comment views are in *_range
document _keys function and rename to jquery_slider_keys
s/image_format/format
s/flaot/float
remove .html('');
renamed:    ../static/notebook/js/widgets/widget_multicontainer.js -> ../static/notebook/js/widgets/widget_selectioncontainer.js
renamed:    widget_multicontainer.py -> widget_selectioncontainer.py
Finished renaming Multicontainer to SelectionContainer
Implement a context manager as a property locking mechanism in Widget.
Merge remote-tracking branch 'jdfreder/widget-msg' into backbone-flat

Conflicts:
	IPython/html/static/notebook/js/widgets/widget_float.js
	IPython/html/static/notebook/js/widgets/widget_int.js
	IPython/html/static/notebook/js/widgets/widget_int_range.js
	IPython/html/static/notebook/js/widgets/widget_selectioncontainer.js
	IPython/html/widgets/widget_selectioncontainer.py