g++ compatibility

Greetings,

I got rid of the itoa() function call (this is no longer supported in many compilers), and included <SDL/SDL.h>, as is now necessary. The code now compiles well with g++. Thanks for your work on this project! I am working on a roguelike with someone else and I don't want to spend a lot of time messing with SDL. This library solves our problem. We'll give credit, of course.

I hope you see this someday, but it looks like you haven't bin on Git in 3 years...