Added assets and a loading screen to deal with different DPIs.  Getting
everything committed and pushed before attempting iOS test/deployment.
All the changes necessary to get things working on iOS (iPhone 4
specifically).  Mostly just some tweaks to which visual elements to
use, somewhat major issues due to eventIds for touchEvents being
different between Android and iOS.  Also using CameraRoll for file save
as FileStream based methods weren't working out (CameraRoll simplifies
things a bit for the user too)