Add models for Estudiante and Tutor
Add models for Estudiante and Tutor

The models for Tutor, and estudiante have been added. Finishing the
implementation of all the models for this app. Some models are
missing some attributes, or relationships that will be implemented
once the rest of the models are created.

erikiado/jp2_online,erikiado/jp2_online,erikiado/jp2_online