Refactored com.stratio.deep.entity.Cells to handle cells belonging to multiple tables
Merge branch 'develop' of github.com:Stratio/stratio-deep into develop

# By Emmanuelle Raffenne
# Via Emmanuelle Raffenne
* 'develop' of github.com:Stratio/stratio-deep:
  Change to specific type for Cassandra config
  Fix class for logger