Added skystone, skystone block, skystone brick, skystone small brick, certus quartz, certus quartz pillar, chiseled certus quartz and fluix stars

To integrate these into the current system, some changes to the background had to be done, especially to the feature handler. It now uses an interface to work against which you can implement to get your own feature handler instead modifying the base one and add several special cases code

src/main/java/appeng/block/stair/SkyStoneBrickStairBlock.java

@@ -0,0 +1,36 @@
+/*
+ * This file is part of Applied Energistics 2.
+ * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
+ *
+ * Applied Energistics 2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Applied Energistics 2 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
+ */
+
+package appeng.block.stair;
+
+
+import java.util.EnumSet;
+
+import net.minecraft.block.Block;
+
+import appeng.block.AEBaseStairBlock;
+import appeng.core.features.AEFeature;
+
+
+public class SkyStoneBrickStairBlock extends AEBaseStairBlock
+{
+	public SkyStoneBrickStairBlock( Block block, Integer meta )
+	{
+		super( block, meta, EnumSet.of( AEFeature.Core ) );
+	}
+}