Feature #907 : subscribing to a suggestion box component.
feature #907 sprint4 : Two important additions:
* OperationPane tag in the taglib viewgenerator takes into account now of the angularjs expressions in the action attribute. For doing, prefix the expression with 'angularjs:'
* A setter of a ContributionValidation instance is defined now in the interface ValidableContribution. Adds a web entity to represent a contribution validation for REST-based web services.
feature #907 sprint4 :   Add a new tag into the JSTL viewGenerator: the attachment pane. It is for rendering the pane for managing the attachments to a resource
Feature #907 : integrating Aurore's work around the homepage of a suggestion box.
(adding angular locale management)
(fixing unit tests)
Feature #907 : refactoring
(get back Transaction mechanism introduced by Miguel to handled the finest as possible the JPA transaction into a service)
(moving user notification sending from SuggestionBox.Suggestions to SuggestionBoxService)
(moving the specific status information of suggestion to the ContributionValidation that is a common object)
Feature #907 : fixing attachment display problem
Feature #907 : fixing display attachments for validated suggestions
(refactoring back Transaction mechanism introduced by Miguel to handled the finest as possible the JPA transaction into a service)
Feature #907 : handling the case of the suggestion box is public
feature #907 sprint4 :
Add a new AngularJS directive to render buttons in a Silverpeas way.
Add the support of AngularJS expression in the JSTL tag button.
Update the support of AngularJS expression in the JSTL tag Operation by taking into account of URLs containing AngularJS expression
feature #907 sprint4 :   Introduce the support of pagination into the Silverpeas repository API. Adds translated messages required by the suggestion box application and that are transveral
Feature #907 : integrating Aurore's work around suggestion page (view and edit) and suggestion list page.
(upgrading angularjs and associated plugin sanitize)
(adding the getting of uploaded file from the HttpRequest)