Action buttons listen to collection events, rather than radio events

[mbuck-r7]

Action button views listen to selection events fired on the collection. We should instead be relying on radio events, to provide a more consistent interface.

See

marionette.carpenter/src/views/action_button.coffee

Lines 33 to 37 in bc13b4e

	@listenTo @tableCollection, 'selection_toggled', () =>
	@setActivationState()
	@listenTo @tableCollection, 'select_all_toggled', () =>
	@setActivationState()