fixed DS-71: we were creating a session in each thread
default we compile with scala 2.11
Merge branch 'bugs/cassandra' into develop
fixed SparkContext static import. Removed PairRDDFunctions instantiation
Merge branch 'develop' of https://github.com/Stratio/deep-spark into develop
DS-74 #close #time 40m Unit and functional tests for Aerospike direct extractor.
Merge branch 'feature/jdbc-extractor' into develop
Merge branch 'develop' into feature/aerospike