Changed:

• Sugar can't be smelted into carbon anymore
• Carbon is now made in the carbonizer
• Asphalt gives a speed boost
• Spawners can now be crafted using steel bar blocks and diamonds
• You can now craft zombie, skeleton and spider spawn eggs
• Changed the texture of steel

Added:

• Carbonizer (Turns sugar into carbon)
• Shelf (Bigger chest/barrel)
• Steel tools (Better than iron, worse than diamond)
• Steel bars + bar blocks (can hold water)
• Steel lamp (Eternal lightsource)
• Discharged Redstone Block (block that redstone connects to, like target blocks) !Blocks added in 1.2