server bump

* jetty 9.3.9.v20160517 fix #436
* undertow 1.3.23.Final fix #435
* netty 4.1.3.Final fix #434

Author: jknack

pom.xml

@@ -2305,10 +2305,10 @@ org.eclipse.jdt.apt.processorOptions/defaultOverwrite=true
   <properties>
     <!-- Dependencies -->
     <jackson.version>2.7.3</jackson.version>
-    <undertow.version>1.3.22.Final</undertow.version>
+    <undertow.version>1.3.23.Final</undertow.version>
     <servlet.version>3.1.0</servlet.version>
-    <jetty.version>9.3.8.v20160314</jetty.version>
-    <netty.version>4.1.1.Final</netty.version>
+    <jetty.version>9.3.9.v20160517</jetty.version>
+    <netty.version>4.1.3.Final</netty.version>
     <javassist.version>3.20.0-GA</javassist.version>
     <javax.ws.rs-api.version>2.0</javax.ws.rs-api.version>
     <slf4j-api.version>1.7.7</slf4j-api.version>