Added CreativeTabs.

src/main/java/com/zandor300/advancedtools/common/creativetabs/CreativeTabATCombat.java

+package com.zandor300.advancedtools.common.creativetabs;
+
+import com.zandor300.advancedtools.core.ATProps;
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.init.Items;
+import net.minecraft.item.Item;
+
+/**
+ * Created by Dennisbonke on 10-2-2015.
+ */
+public class CreativeTabATCombat {
+
+    public static final CreativeTabs ATCombat_tab = new CreativeTabs(ATProps.modid) {
+
+        @Override
+        public Item getTabIconItem() {
+            return Items.golden_sword;
+        }
+
+        @Override
+        public String getTranslatedTabLabel() {
+            return "Advanced Tools:Combat";
+        }
+
+    };
+
+}

src/main/java/com/zandor300/advancedtools/common/creativetabs/CreativeTabATMaterials.java

+package com.zandor300.advancedtools.common.creativetabs;
+
+import com.zandor300.advancedtools.core.ATProps;
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.init.Items;
+import net.minecraft.item.Item;
+
+/**
+ * Created by Dennisbonke on 10-2-2015.
+ */
+public class CreativeTabATMaterials {
+
+    public static final CreativeTabs ATMaterials_tab = new CreativeTabs(ATProps.modid) {
+
+        @Override
+        public Item getTabIconItem() {
+            return Items.gold_ingot;
+        }
+
+        @Override
+        public String getTranslatedTabLabel() {
+            return "Advanced Tools:Materials";
+        }
+
+    };
+
+}

src/main/java/com/zandor300/advancedtools/common/creativetabs/CreativeTabATTools.java

+package com.zandor300.advancedtools.common.creativetabs;
+
+import com.zandor300.advancedtools.core.ATProps;
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.init.Items;
+import net.minecraft.item.Item;
+
+/**
+ * Created by Dennisbonke on 10-2-2015.
+ */
+public class CreativeTabATTools {
+
+    public static final CreativeTabs tab = new CreativeTabs(ATProps.modid) {
+
+        @Override
+        public Item getTabIconItem() {
+            return Items.golden_pickaxe;
+        }
+
+        @Override
+        public String getTranslatedTabLabel() {
+            return "Advanced Tools:Tools";
+        }
+
+    };
+
+}