Merge pull request #30 from Drezil/pull

added setWindowTitle/enabled getWindowTitle
Completes timer API
Export TimerCallback type, check addTimer return status, remove unecessary functions
Merge pull request #31 from jdeseno/timer-api

Completes timer API
Adds SDL platform information
SDL_GetPlatform ffi call should be safe
Merge pull request #33 from jdeseno/platform

Adds SDL platform information
Adds sdl bit function
Merge pull request #34 from jdeseno/bits

Adds sdl bit function
fixed casing in include