Added an enum value SDL_FLIP_BOTH = 0x00000003 in order to allow functions to take A|B which otherwise crashes since A|B doesn't exist in the enum.
Created a thin wrapper for SDL_joystick.h and trying to follow the audio.nim file.
Changed TRendererFlip to cint
added consts
    SDL_FLIP_NONE*: cint = 0x00000000 # Do not flip
    SDL_FLIP_HORIZONTAL*: cint = 0x00000001 # flip horizontally
    SDL_FLIP_VERTICAL*: cint = 0x00000002 # flip vertically
    SDL_FLIP_BOTH*: cint = SDL_FLIP_HORIZONTAL or SDL_FLIP_VERTICAL
Removed SDL_FLIP_BOTH since it does not exist in SDL and we no longer need it since it is no longer an enum.
Added aliases for procs with PJoystick
made const cint
Added three functions that were missing from the .nim wrapper but existed in sdl.h
Merge pull request #10 from AllNamesRTaken/master

Adding missing functions to sdl2.nim as well as a joystick.nim wrapper for SDL_joystick.h