Changes

Tsk35 Adds implementation to add and update stories
Adds in the StoryService the necessary methods to create and update
stories. Creates a new StoryServiceTests to check the IllegalAccess
creations and deletions and adds to the StoryIntegration the test to
check the new implementation. Modifies the sql and xml files to add a
new Author without stories to use in the tests. Modifies the passwords
in the dataset because they were wrong. Adds a new constructor in the
Story class to use in the dataset.