Merge pull request #5 from tcsavage/master

SDL_ShowSimpleMessageBox function
Add lesson4 from twinklebear.
Add lesson5 from twinklebear.
Merge pull request #8 from tcsavage/master

Bindings for OpenGL texture binding functions
binding for touch finger event.
binding for SDL_RenderSetLogicalSize.
mapped touchfinger event type.
Merge pull request #9 from pradeepcodes/osx-ios

Osx ios
Markdownify, and update the WIN32 install instructions
Fix some markdown formatting issues
Fix the Extra-libraries modification
Fix paths for x86_64 and i686 versions of SDL2
Fix paths, and remove explicit directions about SDL2main
Update SDL.cabal for the renamed WIN32 instructions
Add SDL2main as an extra library when on  windows
Merge pull request #10 from elliottt/master

Updated WIN32 instructions
Add createTexture and createSoftwareRenderer
Added updateTexture and misc. changes
Add withTexture
Add lockTexture and misc. other stuff