Added new icons for maintenance carts
Merge pull request #356 from Yopu/maintenance-cart-icons

Added new icons for maintenance carts
Housekeeping
Possible fix for issue #357
Closes #357
Fix typos in changelog.Update changelog
Add a sanity check to the signal renderer
Fixes #358
Make it easier to use Railcraft's render to add new box types in addons
Merge pull request #4 from CovertJaguar/master

Update