Files are stores in folder hierarchy based on hash
Merge branch 'copy-imported-files' of https://github.com/seustachi/DISP-MELM into copy-imported-files

Conflicts:
	src/main/java/lu/hitec/pssu/melm/persistence/dao/MapElementIconDAO.java
	src/main/java/lu/hitec/pssu/melm/persistence/entity/MapElementIcon.java
	src/main/java/lu/hitec/pssu/melm/services/MELMServiceImpl.java
	src/test/java/lu/hitec/pssu/melm/persistence/dao/MapElementIconDAOImplTest.java