added mongodb test
mongodb integration with deep cell
added: filter query, sorting, fields to be returned.
new configutarion paremeters added
Merge branch 'develop' into mongodb-deep-cells

Conflicts:
	deep-commons/src/main/java/com/stratio/deep/entity/Cell.java
	deep-commons/src/main/java/com/stratio/deep/entity/Cells.java
	deep-commons/src/main/java/com/stratio/deep/utils/Utils.java
	deep-commons/src/test/java/com/stratio/deep/entity/CellTest.java
	deep-commons/src/test/java/com/stratio/deep/testentity/CellsTest.java
	deep-commons/src/test/java/com/stratio/deep/testutils/UtilsTest.java
	deep-core/src/test/java/com/stratio/deep/rdd/CassandraCellRDDTest.java
	deep-core/src/test/java/com/stratio/deep/rdd/CassandraJavaRDDTest.java
	deep-examples/src/main/java/com/stratio/deep/examples/java/WritingCellToCassandra.java
	deep-examples/src/main/scala/com/stratio/deep/examples/scala/WritingCellToCassandra.scala
Merge branch 'mongodb-deep-cells' into develop

Conflicts:
	deep-commons/src/main/java/com/stratio/deep/entity/Cell.java
	deep-core/src/main/java/com/stratio/deep/config/DeepJobConfigFactory.java