Define the base inmemory connector structure.
First version of the in-memory connector.
InMemory Connector for Crossdata with issues CROSSDATA-206, CROSSDATA-207, CROSSDATA-208, CROSSDATA-215
Fix ConnectorClusterConfig to include different maps for connectors and cluster options.
Merge branch 'feature/InMemoryConnector' into develop
Merge branch 'develop' of github.com:Stratio/crossdata into develop

Conflicts:
	crossdata-server/src/main/scala/com/stratio/crossdata/server/actors/CoordinatorActor.scala