add simple_dataset_agent with simpler state model and control flow
Merge branch 'master' of github.com:ooici/coi-services into preload_external_data
finish pluggable external dataset agent
bump pyon version (incl utilities)
bump google doc url
remove obsolete test
Merge branch 'master' of github.com:ooici/coi-services into preload_external_data
Merge pull request #1024 from newbrough/preload_external_data

Preload external data