Preware: Fix package loading

* Cleanup & fix errors in packageModel.js
* Rename doDisplayStatus to displayStatus, as it isn't an event handler
* Setup processStatusUpdate in event handler style (inSender, inEvent)
* Pass message from displayStatus to processStatusUpdate via Signals
* Implement navigator.notification.showBanner for load finish
* Show menu list panel on load finish
* Add utility.js from old preware, contains needed functions

Signed-Off-By: Josh Palmer

Signed-Off-By: Josh Palmer <jpalmerwatkins@me.com>