ambiguous documentation for 'onsave' plugin callbacks

[tomaszn]

The documentation should define when the onsave callbacks are run - before or after actually sending the pending items. Current outbox implementation runs all onsave plugins after the outbox items were sent and the local store is updated:

wq.app/js/wq/app.js

Lines 1393 to 1397 in 463c99a

	return model.update([result]).then(function() {
	return Promise.all(_callPlugins(
	'onsave', undefined, [item, result]
	));
	});

[sheppard]

For version 1.2, I renamed this hook to "onsync" and updated the documentation. As the new name reflects, it always runs after the item is sent to the server.