Added movement penalties for appropriate floors

Looking into Perlin noise for map generation here:

• http://digitalerr0r.wordpress.com/2011/05/15/xna-shader-programming-tutorial-25-perlin-noise-using-the-gpu/
• http://freespace.virgin.net/hugo.elias/models/m_perlin.htm
• http://stackoverflow.com/questions/4753055/perlin-noise-generation-for-terrain