Changes

tsk76 Fixes the path of the package for the test files of the service
layer
In the same package "es.uvigo.esei.dgss.teama.microstories.service", the
classes that implement the services and their respective tests have been
put together. This change is due to the fact that these classes must be
at the same level inside the service package and that this structure has
been established in the rest of the modules.