Durability message display hits remaining

Changes the display message sent to players checking the durability of
blocks to display how many hits are left for the block.

Example:

My enchantment table durability was set to 3 in the config, look at the pictures to see the durability before tnt and after 1 tnt.

![2013-02-07_23 44 55](https://f.cloud.github.com/assets/850356/138467/78a38180-71aa-11e2-8b12-0e794b82fef6.png)


![2013-02-07_23 45 05](https://f.cloud.github.com/assets/850356/138468/7df81bbe-71aa-11e2-8714-321dc8881079.png)