Added the block as a second argument to blockUpdate

closes #99
Updated blockUpdated signature to pass (oldBlock, newBlock)
Merge pull request #103 from vogonistic/issue-99

Added the block as a second argument to blockUpdate
block.pos renamed to block.position

sorry I'll try to avoid this in the future. I just wanted this to be
consistent with entity.position
Ensured lookAt takes entity.height into account

Without it, the bot will always look 1.62 too high.

Verification bot here: https://gist.github.com/4637048
Merge pull request #104 from vogonistic/patch-1

Ensured lookAt takes entity.height into account