Updated TODO list.
Updated TODO list.

- Removed "don't generate dirt under grass" thanks to git://github.com/ronmurphy/Minecraft

- Added "Enable blending mode to get semi-transparent textures working. Render in the right order so they show up correctly."

yusihao51/Minecraft,Jimx-/Minecraft,wangjun/Minecraft,beni55/Minecraft,Jimx-/Minecraft