Hibernate readonly mapping folder and JTL function to check for files in /static
- Add /extension/readonly Hibernate mapping folder which is not used during the database model creation
- JTL function to check if a source is available in the /static folder
Merge pull request #50 from CarstenHollmann/feature/hibernate_readonly_mapping_and_jtl_check_function

Hibernate readonly mapping folder and JTL function to check for files in /static