CFY-203 added delete deployment REST API
CFY-203 fixed a bug in es_storage_manager delete_execution; delete_deployment now uses the updated execution status; improved unit and integration tests for delete deployment
CFY-203 fixed integration test for deployment delete; fixed cancel_execution in testenv
CFY-203 tiny fix to cancel_execution call in testenv
Merge pull request #25 from cloudify-cosmo/feature/CFY-203-add-delete-deployment-REST-API

CFY-203 added delete deployment REST API
CFY-203 improved delete deployment integration test
CFY-203 flake8 fix
Merge pull request #26 from cloudify-cosmo/feature/CFY-203-delete-deployment-API

CFY-203 improved delete deployment integration test
CFY-643 node state changes: removed reachable and riemann usage from the code; update_node API can now update node state as well as runtime properties; merged get_state and get_runtime_props params for get-node API into one; get-deployment-node API will now also return state_version for node when get_state parameter is used; node_state is now initialized to 'uninitialized' by default; fixed delete-deployment API to also accept deletion of deployment whose nodes are uninitialized (rather than deleted);  modified *_node_state to *_node_instance; added plugins.* into tests' setup.py
CFY-643 modified travis.yml temporarily for tests
CFY-643 add more unit and integration tests for delete-deployment; added more unit and integration tests for update node API
CFY-643 reverted travis.yml back to its normal state
Merge pull request #27 from cloudify-cosmo/feature/CFY-643-changes-to-node-state

Feature/cfy 643 changes to node state
CFY-642 merge from develop