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/items/tools/powered/ToolPortableCell.java

@@ -23,6 +23,8 @@ import java.util.EnumSet;
 import java.util.List;
 import java.util.Set;
 
+import com.google.common.base.Optional;
+
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.IInventory;
 import net.minecraft.item.ItemStack;
@@ -56,7 +58,7 @@ public class ToolPortableCell extends AEBasePoweredItem implements IStorageCell,
 {
 	public ToolPortableCell()
 	{
-		super( ToolPortableCell.class, null );
+		super( ToolPortableCell.class, Optional.<String> absent() );
 		setFeature( EnumSet.of( AEFeature.PortableCell, AEFeature.StorageCells, AEFeature.PoweredTools ) );
 		maxStoredPower = AEConfig.instance.portableCellBattery;
 	}
@@ -128,6 +130,18 @@ public class ToolPortableCell extends AEBasePoweredItem implements IStorageCell,
 		return 0.5;
 	}
 
+	@Override
+	public String getUnlocalizedGroupName( Set<ItemStack> others, ItemStack is )
+	{
+		return GuiText.StorageCells.getUnlocalized();
+	}
+
+	@Override
+	public boolean isEditable( ItemStack is )
+	{
+		return true;
+	}
+
 	@Override
 	public IInventory getUpgradesInventory( ItemStack is )
 	{
@@ -154,24 +168,12 @@ public class ToolPortableCell extends AEBasePoweredItem implements IStorageCell,
 		}
 	}
 
-	@Override
-	public String getUnlocalizedGroupName( Set<ItemStack> others, ItemStack is )
-	{
-		return GuiText.StorageCells.getUnlocalized();
-	}
-
 	@Override
 	public void setFuzzyMode( ItemStack is, FuzzyMode fzMode )
 	{
 		Platform.openNbtData( is ).setString( "FuzzyMode", fzMode.name() );
 	}
 
-	@Override
-	public boolean isEditable( ItemStack is )
-	{
-		return true;
-	}
-
 	@Override
 	public IGuiItemObject getGuiObject( ItemStack is, World w, int x, int y, int z )
 	{