More ShadowNotification enhancements to capture style and other

-Now captures usesChronometer, style and progress information for later testing.
-Added <code>ShadowBigTextStyle</code> inner class to capture the bigText,  bigContentTitle and summaryText data of <code>Notification.BigTextStyle</code>.
-Imported <code>Notification</code>'s inner classes to make code a bit more compact and readable.