INT-2738 Add Missing getComponentType() Methods

JIRA: https://jira.spring.io/browse/INT-2738

Add a `getComponentType()` method for all handlers,
message producers, and message sources that implement
`NamedComponent` (see `SPCA.getComponentType()`).

Add rome as an optional dependency - STS complained
because AtomFeedHttpMessageConverter has a dependency
on it.

spring-integration-http/src/main/java/org/springframework/integration/http/outbound/HttpRequestExecutingMessageHandler.java

@@ -342,6 +342,11 @@ public class HttpRequestExecutingMessageHandler extends AbstractReplyProducingMe
 		this.transferCookies = transferCookies;
 	}
 
+	@Override
+	public String getComponentType() {
+		return (this.expectReply ? "http:outbound-gateway" : "http:outbound-channel-adapter");
+	}
+
 	@Override
 	protected void doInit() {
 		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(this.getBeanFactory());