BuildCraft/BuildCraft — pull request #1568 by fabricator77 (2014-04-01 23:33:31+00:00)
Title: Fix crash in BiomeInitializer when used in non standard WorldTypes

Fixes crash when BiomeInitializer runs in WorldTypes with less that three GenLayers. For example a world without river gen only has 2 Layers, the river is the 3rd.

Also remove redundant old code.