Upgrade to Jetty 9.2.6.v20141205

Changelog:

http://dev.eclipse.org/mhonarc/lists/jetty-announce/msg00071.html

pom.xml

@@ -227,7 +227,7 @@
     <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-servlet</artifactId>
-      <version>9.2.5.v20141112</version>
+      <version>9.2.6.v20141205</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>