Added IMC support for adding assembly and refinery recipes.

I think we shouldn't dismantle API adding, since if i do a complete addon it'll be easier to use, than IMC.

PS Is this just in NextGen buckets-machines behavior is broken? Or whole 1.7.2?
Merge branch 'patch-2' of https://github.com/anti344/BuildCraft into anti344-patch-2
prepare 6.0.4 release
Merge branch 'BuildCraft-5.1.x' into NextGen