Fixed a bug when trying to add or modify a Grade without a label.
Now using Neo4J for data
Edit config file
Merge branch 'master' of https://github.com/NathanMarin/themis-back
Edit configs again
Merge branch 'usecase-grade'
Merge branch 'usecase-grade'
Now with more beautiful Scala -- Simplify RankPersistence
Add files for Corps
Move persistence files to a new package for visibility
Merge branch 'usecase-grade'