Start streaming history records
Merge pull request #928 from StackStorm/feature/stream_history

Start streaming history records
Print client settings when an exception is thrown and debug mode (--debug flag)
is enabled.
Merge pull request #933 from StackStorm/client_debugging_improvements

Improve client debug mode
Update changelog.
Merge branch 'master' of github.com:StackStorm/stanley into allow_sensors_to_store_and_retrieve_data_from_datastore
Update affected "key load" client command.
Update affected docs.
Fix KVP deletion.
Update affected datastore tests.