Fixes firestone repair bug

Fixed by overriding isRepairable() in ItemFirestoneBase
Started work on integrating the hopper minecart
Merge pull request #336 from Yopu/hopper

Started work on integrating the hopper minecart
Merge pull request #333 from Yopu/firestone

Fixes firestone repair bug
Merge remote-tracking branch 'CovertJaguar-Railcraft/master' into furnace

Conflicts:
	src/main/java/mods/railcraft/common/carts/EnumCart.java