Update Jetty to 8.1.3.v20120416

Jetty 8.1.3 comes with Juno M7 and this version can be installed from
http://download.eclipse.org/jetty/updates/jetty-bundles-8.x/8.1.3.v20120416/

Change-Id: Ifc4bfbb3efbab0f5bfbde74f0b2ddc5a2f9ee6a5
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>