Since now SDL 1.3 is SDL 2, i decided to change all the references to SDL 1.3 to SDL 2, and made all the changes to make it compatible with the engine.
To compile eepp in windows now is needed to declare the SDL version that i will use, now it isn't posible to find which version is installed on the system ( -DEE_SDL_VERSION_2, EE_SDL_VERSION_1_3 or EE_SDL_VERSION_1_2 ).
Minor fixes on utils.cpp include files.
Cleaned up empty window demo.
Updated the Makefile, now decides which version of SDL use ( SDL2 is priorized ).
