Add Closeable to JedisPool.

This allows JedisPool instances to also participate in try-with-resources.

Adds tests (both for JedisPool and the Jedis code itself).

src/main/java/redis/clients/util/Pool.java

@@ -1,5 +1,7 @@
 package redis.clients.util;
 
+import java.io.Closeable;
+
 import org.apache.commons.pool2.PooledObjectFactory;
 import org.apache.commons.pool2.impl.GenericObjectPool;
 import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
@@ -7,7 +9,7 @@ import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
 import redis.clients.jedis.exceptions.JedisConnectionException;
 import redis.clients.jedis.exceptions.JedisException;
 
-public abstract class Pool<T> {
+public abstract class Pool<T> implements Closeable {
     protected GenericObjectPool<T> internalPool;
 
     /**
@@ -17,6 +19,15 @@ public abstract class Pool<T> {
     public Pool() {
     }
 
+    @Override
+    public void close() {
+	closeInternalPool();
+    }
+
+    public boolean isClosed() {
+	return this.internalPool.isClosed();
+    }
+
     public Pool(final GenericObjectPoolConfig poolConfig,
 	    PooledObjectFactory<T> factory) {
 	initPool(poolConfig, factory);
@@ -81,4 +92,4 @@ public abstract class Pool<T> {
 	    throw new JedisException("Could not destroy the pool", e);
 	}
     }
-}
+}