Added BC API to repo

.gitignore

@@ -16,6 +16,7 @@ CHANGELOG
 !/src/minecraft/universalelectricity/
 !/src/minecraft/dan200
 !/src/minecraft/ic2
+!/src/minecraft/buildcraft
 !/resources/
 !/models/
 !info.txt

src/minecraft/buildcraft/api/tools/IToolWrench.java

@@ -0,0 +1,32 @@
+package buildcraft.api.tools;
+
+import net.minecraft.entity.player.EntityPlayer;
+
+/***
+ * Implement this interface on subclasses of Item to have that item work as a wrench for buildcraft
+ */
+public interface IToolWrench {
+
+	/***
+	 * Called to ensure that the wrench can be used. To get the ItemStack that is used, check player.inventory.getCurrentItem()
+	 * 
+	 * @param player
+	 *            - The player doing the wrenching
+	 * @param x
+	 *            ,y,z - The coordinates for the block being wrenched
+	 * 
+	 * @return true if wrenching is allowed, false if not
+	 */
+	public boolean canWrench(EntityPlayer player, int x, int y, int z);
+
+	/***
+	 * Callback after the wrench has been used. This can be used to decrease durability or for other purposes. To get the ItemStack that was used, check
+	 * player.inventory.getCurrentItem()
+	 * 
+	 * @param player
+	 *            - The player doing the wrenching
+	 * @param x
+	 *            ,y,z - The coordinates of the block being wrenched
+	 */
+	public void wrenchUsed(EntityPlayer player, int x, int y, int z);
+}