CFY-203 added get-deployment and delete-deployment REST calls
CFY-203 added get_execution api
Merge pull request #6 from cloudify-cosmo/feature/CFY-203-add-delete-deployment-REST-API

CFY-203 added get-deployment and delete-deployment REST calls
Fixed cancel execution call - it will now return the execution that was cancelled
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...
CFY-645 merged from epic branch