Changes

tsk10 Refactores some improvements related with StoryEJB class
First of all getStoriesContainingText() method do not follow
nomenclature of rest of methods so was rename like getStoriesByText(),
secondly the sub lists used in testGetStoriesContainingText() method in
TestStoryEJB class was created in StoryDataset class and finally is(new
ArrayList<>()) was changes
by is(empty()).