Feature 3798 : Rating service

- updating notation EJB to be more reusable
- moving and renaming main classes (Rating.java and RatingPK.java) from ejb-core to lib-core
- adding a jQuery plugin : rateit
- making a REST service which wrap jQuery plugin. It ables to display global rating and permit user to rate any resource.
- making an AngularJS directive and service over this REST service
- improving silverpeas-adapters.js and silverpeas-angular.js

Do not omit Silverpeas-Components...