iOS: Update Info.plist for iPad support (thanks @bsauvage1.)

Reportedly fixes #1015 and #1067.

Let's try it, it doesn't hurt iPhone and it sounds good.

http://developer.apple.com/library/ios/#documentation/general/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW11

-[Unknown]