[Bleeding] Add new sub-event for target goals, and DEFEND_VILLAGE TargetReason. Fixes BUKKIT-935

src/main/java/org/bukkit/event/entity/EntityTargetLivingEntityEvent.java

@@ -0,0 +1,32 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.LivingEntity;
+
+/**
+ * Called when an Entity targets a {@link LivingEntity} and can only target LivingEntity's.
+ */
+public class EntityTargetLivingEntityEvent extends EntityTargetEvent{
+    public EntityTargetLivingEntityEvent(final Entity entity, final LivingEntity target, final TargetReason reason) {
+        super(entity, target, reason);
+    }
+
+    public LivingEntity getTarget() {
+        return (LivingEntity) super.getTarget();
+    }
+
+    /**
+     * Set the Entity that you want the mob to target.
+     * It is possible to be null, null will cause the entity to be
+     * target-less.
+     * <p />
+     * Must be a LivingEntity, or null
+     *
+     * @param target The entity to target
+     */
+    public void setTarget(Entity target) {
+        if (target == null || target instanceof LivingEntity) {
+            super.setTarget(target);
+        }
+    }
+}