Fixes firestone repair bug

Fixed by overriding isRepairable() in ItemFirestoneBase
Started work on integrating the hopper minecart
Fixes furnace cart bug
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
Merge pull request #335 from Yopu/furnace

Fixes furnace cart bug
Update submodules
Fix metal blocks and nuggets to actually return null when disabled.
Closes #338
Make Anchor/Sentinel pairing more flexible (order of pairing no longer matters) and add more error messages.
Some minor Firestone Code cleanup.
Update Changelog

Conflicts:
	src/main/resources/change_log.txt
Update code for Forestry API changes.
Add beta access clause to readme.
Update lang
Merge branch 'master' of github.com:CovertJaguar/Railcraft
Fixed steam oven rendering
Merge pull request #340 from Yopu/steam-oven

Fixed steam oven rendering