Replaced all instances of Guava's Optional type with Java 8's Optional type, as discussed in #81. (#90)

src/main/java/appeng/items/tools/powered/ToolMassCannon.java

@@ -293,10 +293,10 @@ public class ToolMassCannon extends AEBasePoweredItem implements IStorageCell
 				final Block whatsThere = w.getBlockState( hitPos ).getBlock();
 				if( whatsThere.isReplaceable( w, hitPos ) && w.isAirBlock( hitPos ) )
 				{
-					for( final Block paintBlock : AEApi.instance().definitions().blocks().paint().maybeBlock().asSet() )
+					AEApi.instance().definitions().blocks().paint().maybeBlock().ifPresent( paintBlock ->
 					{
 						w.setBlockState( hitPos, paintBlock.getDefaultState(), 3 );
-					}
+					} );
 				}
 
 				final TileEntity te = w.getTileEntity( hitPos );

src/main/java/appeng/items/tools/powered/powersink/IC2.java

@@ -19,7 +19,7 @@
 package appeng.items.tools.powered.powersink;
 
 
-//import com.google.common.base.Optional;
+//import java.util.Optional;
 //
 //import net.minecraft.entity.EntityLivingBase;
 //import net.minecraft.item.Item;

src/main/java/appeng/items/tools/powered/powersink/RedstoneFlux.java

@@ -19,7 +19,7 @@
 package appeng.items.tools.powered.powersink;
 
 
-//import com.google.common.base.Optional;
+//import java.util.Optional;
 //
 //import net.minecraft.item.ItemStack;
 //