Changes

Summary

1. Add a few exceptions if the pipes stateis invalid (commit: b9615e2) (details)

Commit b9615e2095e075ef3329973f29e80d908bed3fc4 by AlexIIL Add a few exceptions if the pipes stateis invalid (commit: b9615e2)
	common/buildcraft/transport/BlockGenericPipe.java (diff)
	common/buildcraft/transport/TileGenericPipe.java (diff)
	api/buildcraft/api/events/PipePlacedEvent.java (diff)