Merge pull request #988 from lukecampbell/cov_bump

Updates cov model ref
Make sub type strings.
Bump persistence test timeout to 5m.
Fix AS integration test
Merge branch 'master' of github.com:ooici/coi-services
fix param creation for test
Bumped ion-defs
Merge pull request #991 from shenrie/master

Fix AS integration tests
Merge pull request #989 from newbrough/preload_external_data

fix param creation for test
Merge pull request #981 from lukecampbell/qc

QC Work
bump pyon for json/unicode fix and endpoint exception fix
catching Timout exceptions and removed commented code
Fixed merge issues
Bump ion def to include new dev es server
Added logic to check if stream definition exists localy before retrieving it from pubsub
Merge branch 'master' of github.com:ooici/coi-services
Update visualization transform to remove messaging call during granule processing
Fix merge conflict
Merge pull request #992 from shenrie/master

Update visualization transform to remove messaging call during granule processing
Bumped ion-defs