Working on the Execution planning
Merge branch 'future/0.1.0' of github.com:Stratio/stratio-meta into future/0.1.0

Conflicts:
	meta-common/src/main/java/com/stratio/meta2/common/metadata/ClusterMetadata.java
	meta-core/src/main/java/com/stratio/meta2/core/metadata/MetadataManager.java
	meta-core/src/main/java/com/stratio/meta2/core/planner/Planner.java
Merge branch 'future/0.1.0' of github.com:Stratio/stratio-meta into future/0.1.0

Conflicts:
	meta-connector/src/main/scala/com/stratio/connectors/ConnectorActor.scala