Started working on the new config GUI. Looks pretty nice!

src/main/java/de/skate702/craftingkeys/config/GuiConfigHandler.java

@@ -0,0 +1,22 @@
+package de.skate702.craftingkeys.config;
+
+import cpw.mods.fml.common.network.IGuiHandler;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.world.World;
+
+public class GuiConfigHandler implements IGuiHandler {
+
+    @Override
+    public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
+        return null;
+    }
+
+    @Override
+    public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
+        if (ID == GuiConfig.GuiID) {
+            return new GuiConfig();
+        }
+
+        return null;
+    }
+}