Preware: Further UI Work

* Move PalmServiceBridge checks into create() for browser compatibility
* Move ondeviceready handling into AppPanels, rename handler 'handleDeviceReady'
* Move reflow checks into AppPanels
* Begin package loading in handleDeviceReady()
* Create Menu, Category, Subcategory and Package Panels

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