Mineflayer

* expose the materials enum as `mineflayer.materials`

* digging is faster and has less bugs
* you can stop digging with `bot.stopDigging()`.
* `bot.dig(block, [timeout], [callback])` changed to `bot.dig(block, [callback])`.
* add `bot.digTime(block)`
* add `block.material`
* add `block.harvestTools`
* add `window.emptySlotCount()`
* block and item enums are cleaned up. Every block and item has an
unambiguous `name` and `displayName`.

* add missing recipe for wooden planks
* fix various crafting and inventory bugs
* unequip works with hand as a destination

* add `mineflayer.Location` which can help you locate chunk boundaries
* `entity.metadata` is formatted as an object instead of an array for
easier access
* `canDigBlock` returns `false` if `block` is `null` instead of crashing.

* fix `bot.heldItem` being wrong sometimes
* water and lava are not solid

* `bot.equip` - wait at least a tick before calling callback