added godot icon

Hey there

Love the icons! I've made a new icon for the Godot game engine (http://www.godotengine.org). If you want to include it, that would be great. 

I've got a few more icon ideas brewing. Shoud I just raise a pull request when I have something or would you prefer I email them to you?

I'm pretty new to the open source world, so I'm not really sure of the etiquette.

Anyway, hope this might be useful - if you don't want to use it, dont worry as I wont be offended!

Cheers

James