In Flower Forest biome a Poppy should spawn instead of Blue Orchid Closes #1078
Added Farmland to PLAINS type plants as that has changed in 1.7. Also made BlockTallGrass call it's super.canBlockStay to better support custom soils. Closes #1077
Added accessible instance to RenderBlocks and RenderItem for modders to use who don't wish to create there own instance. Warning: Other modders may influance the transient state of the instance, BE WEARY MODDERS.