I have implemented the ASCII art images class

Hi.

I have been working to add the ASCII art images class.

The main work is not mine, it is from (jsAscii 0.1
 * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/).

But I have added blit functions and rewrote some parts for to make "rot.js standar". 

Regards.