Update Alloy templates

- Re-Organises platform files copied in by new-command
- Moves MarketPlaceArtwork.png to the project root folder to save APK size
- Adds iTunesConnect.png to the project root folder
- Adds iOS7 icons
- Adds iTunesArtwork@2x file (note: upscaled!)
- Optimised all assets, saving more then 1MB or 20%