update netty and jackson to the latest versions

netty/pom.xml

@@ -13,22 +13,23 @@
 		<dependency>
 			<groupId>io.netty</groupId>
 			<artifactId>netty-codec-http</artifactId>
-			<version>4.0.17.Final</version>
+			<version>4.0.21.Final</version>
 		</dependency>
 		<dependency>
 			<groupId>io.netty</groupId>
 			<artifactId>netty-transport-native-epoll</artifactId>
-			<version>4.0.17.Final</version>
+			<version>4.0.21.Final</version>
+			<classifier>linux-x86_64</classifier>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-databind</artifactId>
-			<version>2.3.1</version>
+			<version>RELEASE</version>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.module</groupId>
 			<artifactId>jackson-module-afterburner</artifactId>
-			<version>2.3.1</version>
+			<version>RELEASE</version>
 		</dependency>
 		<dependency>
 			<groupId>javassist</groupId>