Added getters for the free objects in the pooled engine.

ashley/src/com/badlogic/ashley/core/PooledEngine.java

@@ -1,12 +1,12 @@
 /*******************************************************************************
  * Copyright 2014 See AUTHORS file.
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *   http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -85,6 +85,20 @@ public void clearPools () {
 		componentPools.clear();
 	}
 
+	/**
+	 * @return Number of free objects in the entity pool.
+	 */
+	public int getEntityPoolFree( ) {
+		return entityPool.getFree();
+	}
+
+	/**
+	 * @return Number of free objects in the given component type pool.
+	 */
+	public <T extends Component> int getComponentPoolFree(Class<T> componentType) {
+		return componentPools.pools.get(componentType).getFree();
+	}
+
 	@Override
 	protected void removeEntityInternal (Entity entity) {
 		super.removeEntityInternal(entity);