Select support to pipeline. Thanks to @ib84

src/main/java/redis/clients/jedis/Pipeline.java

@@ -1226,4 +1226,9 @@ public class Pipeline extends Queable {
         client.randomKey();
         return getResponse(BuilderFactory.STRING);
     }   
+    
+    public Response<String> select(int index){
+    	client.select(index);
+    	return getResponse(BuilderFactory.STRING);
+    }
 }

src/test/java/redis/clients/jedis/tests/PipeliningTest.java

@@ -101,6 +101,13 @@ public class PipeliningTest extends Assert {
         assertNotNull(score.get());    
     }
     
+    @Test
+    public void pipelineSelect() {
+        Pipeline p = jedis.pipelined();
+        p.select(1);
+        p.sync();
+    }
+    
     @Test
     public void pipelineResponseWithoutData() {
         jedis.zadd("zset", 1, "foo");