Two config changes

Hi Di3mex; I contacted you earlier on Bukkit before I found your repo here.  I mentioned I would like to submit some changes that have been useful to me and may be useful to others:

1) A new permission node, extrahardmode.bypass.inventory, will prevent inventory loss for that player in the event of that player's death, if ExtraHardMode.Player.Death.Item Stacks Forfeit Percent is > 0.

2) Two new nodes in config.yml, ExtraHardMode.Mining.If Tunneling Is Inhibited.Iron Pickaxe Durability Penalty and .Diamond Pickaxe Durability Penalty allow plugin users to directly modify how much extra durability damage per broken stone each pick should take.

Let me know if you have any questions, and thank you!

--MKindy