Fix NPE when Jackson not present

When using the `KafkaTemplate.send(Message<?>)` variant, an NPE was thrown
if Jackson wasn't on the classpath.

# Conflicts:
#	spring-kafka/src/main/java/org/springframework/kafka/support/converter/MessagingMessageConverter.java

* Also revert to `1.3.2.B-S`

Author: garyrussell

gradle.properties

@@ -1,2 +1,2 @@
-version=1.3.3.BUILD-SNAPSHOT
+version=1.3.2.BUILD-SNAPSHOT
 org.gradle.daemon=true

spring-kafka/src/main/java/org/springframework/kafka/support/converter/MessagingMessageConverter.java

@@ -132,7 +132,9 @@ public Message<?> toMessage(ConsumerRecord<?, ?> record, Acknowledgment acknowle
 		Object payload = convertPayload(message);
 		Long timestamp = headers.get(KafkaHeaders.TIMESTAMP, Long.class);
 		RecordHeaders recordHeaders = new RecordHeaders();
-		this.headerMapper.fromHeaders(headers, recordHeaders);
+		if (this.headerMapper != null) {
+			this.headerMapper.fromHeaders(headers, recordHeaders);
+		}
 		return new ProducerRecord(topic == null ? defaultTopic : topic, partition, timestamp, key, payload,
 				recordHeaders);
 	}