emerald and obsidian tools and armour 2 dimension and 2 new biome

the coal biome has been added you can use coal log to have coal plank (the texture are not the best i never did a texture on a block)
the obsidian entities only can be spawn in the forest and their dimension 
minecraft didn't work today that why the version is 1.6.5.2 and not 1.6.6
if there any bugs please comment so i can try to fix it