cleanups: Remove dead code and unused imports
Rename packages

It makes no sense to call something at.roomplanning if you do not own
the domain roomplanning.at ... the reverse domain naming scheme is used
to make package names unique because domains are already uniquly
assigned.
Convert to spring

Convert to a spring project and remove hibernate XML file, its no longer
needed can be configured all in java.
Implement daos
Rename entities to model

This matches the spring naming scheme.
Add AlgorithmGroupRepository
daos: Extend PagingAndSortingRepository which has built in sort support
Add dummy to test/resources to keep the dir in git
Add initial ant colony optimization algorithm datastructures