feature #907 sprint2 :   Now a suggestion can be deleted. Take into account a suggestion can be updated or deleted only if it is in a draft mode. Enrich the tests on the web component controller to cover the potential errors. The deletion can be done for instance from the suggestionBox.jsp through an HTML form and with angularjs; it will be required to replace this behavior with the one that uses the web service to delete a given suggestion once this web service is implemented