Upgrade to Jackson 2.3.4

Closes #1406

spring-boot-dependencies/pom.xml

@@ -72,7 +72,7 @@
 		<httpasyncclient.version>4.0.1</httpasyncclient.version>
 		<hornetq.version>2.4.3.Final</hornetq.version>
 		<hsqldb.version>2.3.2</hsqldb.version>
-		<jackson.version>2.3.3</jackson.version>
+		<jackson.version>2.3.4</jackson.version>
 		<janino.version>2.6.1</janino.version>
 		<javassist.version>3.18.1-GA</javassist.version> <!-- Same as Hibernate -->
 		<jedis.version>2.4.2</jedis.version>