Added unwatch command

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

@@ -379,4 +379,8 @@ public class Client extends Connection {
     public void watch(String key) throws JedisException {
 	sendCommand("WATCH", key);
     }
+
+    public void unwatch() throws JedisException {
+	sendCommand("UNWATCH");
+    }
 }

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

@@ -491,4 +491,9 @@ public class Jedis {
 	return client.getStatusCodeReply();
     }
 
+    public String unwatch() throws JedisException {
+	client.unwatch();
+	return client.getStatusCodeReply();
+    }
+
 }

src/test/java/redis/clients/jedis/tests/commands/TransactionCommandsTest.java

@@ -92,4 +92,26 @@ public class TransactionCommandsTest extends Assert {
 	List<Object> resp = t.exec();
 	assertEquals(new ArrayList<Object>(), resp);
     }
+
+    @Test
+    public void unwatch() throws JedisException, UnknownHostException,
+	    IOException {
+	jedis.watch("mykey");
+	String val = jedis.get("mykey");
+	val = "foo";
+	String status = jedis.unwatch();
+	assertEquals("OK", status);
+	Transaction t = jedis.multi();
+
+	Jedis nj = new Jedis("localhost");
+	nj.connect();
+	nj.set("mykey", "bar");
+	nj.disconnect();
+
+	t.set("mykey", val);
+	List<Object> resp = t.exec();
+	List<Object> expected = new ArrayList<Object>();
+	expected.add("OK");
+	assertEquals(expected, resp);
+    }
 }