Merge pull request #12 from learning-layers/data_model

Data model
Merge pull request #13 from learning-layers/data_model_realisation

Hibernate integration and Hibernate test.
added remotly reachable database
Merge pull request #14 from learning-layers/addedDatabase

added remotly reachable database
Preliminary commit so that I fetch the latest develop.
Connection to remote database
and few more mapped classes added.