Fixes the hammer mining level of adjacent blocks

Fixed the hammer mining levels and tested with Metallurgy 3.3.2

Screenshots :)

![2014-02-16_02 06 19](https://f.cloud.github.com/assets/5352172/2179206/02b82f16-9698-11e3-980d-3b0a9c25d3d2.png)
![2014-02-16_02 06 37](https://f.cloud.github.com/assets/5352172/2179207/02eb74b6-9698-11e3-826a-9b1cd1a9759a.png)