CFY-643 modified update_node API - now has state parameter too; added state_version field to DeploymentNode; merged get_state and get_runtime_props parameters into one; modified *_node_state into *_node_instance
Merge pull request #7 from cloudify-cosmo/feature/CFY-643-changes-to-node-state

CFY-643 modified update_node API - now has state parameter too; added st...