Changes

tsk5 Fixes the story service to provide the latest published stories
Fixes the sql sentence of the method in service layer to properly return 
the 6 most recent published storioes. This method called "last" is 
properly renamed to "getRecent". In addition, the service test have been 
reworked (involving the datasets) to check the requirements of getting 6 
stories and returning those published in order by date. Consequently, 
the jsf and rest layers have been adapted to the changes in the method 
of service. Finally, it has been corrected the missing of the two topics 
in the isEqualToStory class.