Feature #907 : refactoring Rating services
- adding new unit test bases
Feature #907 : adding suggestion rating
- adding new session cache service
- fixing a NullPointerException on statistic query
Feature #907 : adding the possibility to get constant values of inner classes or inner enums from JSTL
Feature #907 : some adjustments
Feature #907 : introducing a new mechanism to handle navigation view points
(adding a new angular directive to handle HTML container display toggling)