Restored original behavior of Salvage.isSalvageable

It doesn't check for custom armors, I don't know if it's a bug or not
Added isMinecraftTool and isMinecraftArmor for clarity

src/main/java/com/gmail/nossr50/skills/repair/Salvage.java

@@ -141,10 +141,10 @@ public class Salvage {
      * @return true if the item is salvageable, false otherwise
      */
     public static boolean isSalvageable(final ItemStack is) {
-        if (configInstance.getSalvageTools() && (ItemChecks.isTool(is) || ItemChecks.isStringTool(is) || is.getType() == Material.BUCKET)) {
+        if (configInstance.getSalvageTools() && (ItemChecks.isMinecraftArmor(is) || ItemChecks.isStringTool(is) || is.getType() == Material.BUCKET)) {
             return true;
         }
-        if (configInstance.getSalvageArmor() && ItemChecks.isArmor(is)) {
+        if (configInstance.getSalvageArmor() && ItemChecks.isMinecraftArmor(is)) {
             return true;
         }
         return false;

src/main/java/com/gmail/nossr50/util/ItemChecks.java

@@ -257,6 +257,16 @@ public class ItemChecks {
         return isHelmet(is) || isChestplate(is) || isLeggings(is) || isBoots(is);
     }
 
+    /**
+     * Checks to see if an item is a wearable armor piece.
+     *
+     * @param is Item to check
+     * @return true if the item is armor, false otherwise
+     */
+    public static boolean isMinecraftArmor(ItemStack is) {
+        return isDiamondArmor(is) || isGoldArmor(is) || isIronArmor(is) || isDiamondArmor(is);
+    }
+
     /**
      * Checks to see if an item is a leather armor piece.
      *
@@ -339,7 +349,7 @@ public class ItemChecks {
      * @param is Item to check
      * @return true if the item is a tool, false otherwise
      */
-    public static boolean isTool(ItemStack is) {
+    public static boolean isMinecraftTool(ItemStack is) {
         return isStoneTool(is) || isWoodTool(is) || isGoldTool(is) || isIronTool(is) || isDiamondTool(is) || isStringTool(is);
     }