Made computer cases and screens dyable.
Dye isn't consumed because ICBA to save that in the dropped blocks' NBT tag.
Merge branch 'master' of github.com:MightyPirates/OpenComputers into MC1.7

Conflicts:
	src/main/scala/li/cil/oc/common/block/Case.scala
	src/main/scala/li/cil/oc/common/block/Screen.scala