Updated README.iOS to have up-to-date instructions for creating an app from scratch (not from SDL's Xcode templates).
added UIViewController pointer to SDL_SysWMinfo for iOS
made Game Center's welcome banner show by having SDL display its inner UIWindow once on SDL window initialization, rather than on every frame
Merge with latest SDL code from hg.libsdl.org
Fix for UIScrollView instances not scrolling properly in iOS apps that don't use SDL_iPhoneSetAnimationCallback
Fix for Game Center leaderboard screens not always responding to touch input in iOS apps that don't use SDL_iPhoneSetAnimationCallback
Fix for iOS touch input coordinates being halved on Retina displays
Merged with latest SDL2 sources
Xcode project for iOS uses spaces for tabs, as per most (all?) SDL source files
Removed custom code that fixed Game Center notifications non-display, in favor of an official fix (done via UIKit_ShowWindow).
merged with the latest, official, SDL 2 sources
added Visual Studio 2012 projects for SDL and SDLmain (but not tests)
Got a bare-bones version of SDL compiling for Windows RT.  Dummy drivers are used in some places.  Very little Windows-specific code (from the Win32 version of SDL) is used.
reverted a minor, unnecessary change in SDL_rwops.c that was done with regards to WinRT compilation
added missing Visual Studio 2012 .sln file for WinRT
WinRT: used Win32-style DECLSPEC and SDLCALL macros (for building a .dll)
WinRT: made SDL.dll compile for ARM (and not just x86 or x64)
WinRT: created SDLmain library using most of VC++ 2012's template for Direct3D 11 apps.  Most of this will be moved into SDL itself.
WinRT: moved contents of platform-specific SDLmain into SDL.dll, where it should probably have been in the first place
WinRT: removed some debugging code I added in earlier