Infos du package
Check java 7 package is installed

Before installing package, ensure Java 7 package is here
Package content an custom config

The package content itself that consists in a jetty tarball and the 2
config files that needed to be customized :
- jetty-deploy.xml : changes the monitored application folder into
  /volume1/webapps
- jetty-logging.xml : changes the log filename into jetty.log
Post (un)installation scripts

The postinstall script untar de jetty archive, update the configuration files and
create the webapps shared folder
The postuninstall script delete the webapps folder
start/stop script

jetty is ran on port 8081 and custom logging configuration
is taken into account