Added flex properties to container.
Also replaced underscores in flex align properties with dashes.
Added flex properties example to alignment tutorial.
Added File Upload Widget example for Chris Kees
Updated comments in File Upload Widget example.
FileUploadWidget- Removed backbone events line, added headers
Added an example that shows how to make a custom date picker widget
Fix: added inspect import to widget.py
Remove init_widget_js, use require.js for everything
Updated examples
Fixed bug with message throttling
Added missing basic_widgets js
Added missing types import
renamed:    basic_widgets.py -> basic_widgets.js
Fixed typos in throttling code.
Updated pointer to HEAD of components sub-branch
POST-REBASE Re-added widgets reference
FAB CSS
Fixed casperjs widget tests
to match WidgetManager requirejs load changes
Added check on widget close to make sure comm isn't already none.
Added Variable Inspector example
Fixed bug that prevent model.save() from being called on
widget models without views.
Added Export As button
calls nbconvert...