Documentating the engine..

I've been into documenting the engine properly, so i can provide a decent first release of my project.

This mainly consists in describing the engine design and functionalities inside the code, so the documentation page can be generated right. I am also writing all kinds of useful notes in the classes as well as mini-tutorials.

Later, better tutorials will be built, hopefully with community help!

I will be telling the news often until the first official release :)