Add alternate constructor to MessageListenerAdapter

As a convenience when configuring with Java, added another constructor
call that allows setting the delegate and the default listener method
in one line of code.

```java
	public MessageListenerAdapter(Object delegate, String defaultListenerMethod) {
		this(delegate);
		setDefaultListenerMethod(defaultListenerMethod);
	}
```

This supports configuring a POJO-based listener with a single step:

```java
	@Test
	public void testCustomMethodWithAlternateConstructor() throws Exception {
		MessageListenerAdapter adapter = new MessageListenerAdapter(target, "customMethod");
		adapter.afterPropertiesSet();

		adapter.onMessage(STRING_MSG, null);

		verify(target).customMethod(PAYLOAD);
	}
```

A pure Java configuration bean can now look like this:
```java
	 @Bean
	 MessageListenerAdapter listenerAdapter(Receiver receiver) {
		 return new new MessageListenerAdapter(receiver, "pojoMethod");
	 }
	 @Bean
	 Receiver receiver() {
		 return new Receiver();
	 }
```
No longer do we have to A) assign the adapter to a variable and B) call
setDefaultListenerMethod, slimming down pure POJO configuration with pure
Java.

src/main/java/org/springframework/data/redis/listener/adapter/MessageListenerAdapter.java

@@ -105,6 +105,7 @@ import org.springframework.util.StringUtils;
  * 
  * @author Juergen Hoeller
  * @author Costin Leau
+ * @author Greg Turnquist
  * @see org.springframework.jms.listener.adapter.MessageListenerAdapter
  */
 public class MessageListenerAdapter implements InitializingBean, MessageListener {
@@ -206,6 +207,19 @@ public class MessageListenerAdapter implements InitializingBean, MessageListener
 		initDefaultStrategies();
 		setDelegate(delegate);
 	}
+	
+	/**
+	 * Create a new {@link MessageListenerAdapter} for the given delegate.
+	 * 
+	 * @param delegate the delegate object
+	 * @param defaultListenerMethod method to call when a message comes
+	 * 
+	 * @see #getListenerMethodName
+	 */
+	public MessageListenerAdapter(Object delegate, String defaultListenerMethod) {
+		this(delegate);
+		setDefaultListenerMethod(defaultListenerMethod);
+	}
 
 	/**
 	 * Set a target object to delegate message listening to. Specified listener