Test
SparkSQL integration with cells. Pending tests.
Merge branch 'develop' into feature/sparksql-integration

Conflicts:
	deep-core/src/main/java/com/stratio/deep/core/context/DeepSparkContext.java
	deep-core/src/test/java/com/stratio/deep/core/context/DeepSparkContextTest.java
Merge with develop.
Unit tests for sparkSQL integration
Merge branch 'develop' into feature/sparksql-integration