Release Version 2.0.21
Bump Version to 2.0.22-dev
Bump epu
Updates ion-functions
Bump epu
Merge pull request #926 from newbrough/preload_external_data

Preload external data
Add keywords and created_by to SGS attachment create route
Merge pull request #929 from daf/sgs_attachment_keywords_createdby

Add keywords and created_by to SGS attachment create route
use assertEquals (assertItemsEqual is not appropriate here)
should use to _basic_resource_create
Merge branch 'master' of github.com:ooici/coi-services into preload_external_data
Adds unit system support for ion loader
Merge pull request #930 from lukecampbell/units

Adds unit system support for ion loader
bump
Merge pull request #928 from lukecampbell/ionfuncs

Updates ion-functions
Enhanced instrument model OOI preload - more attributes
fix agent client retrieve
Merge branch 'master' of github.com:ooici/coi-services
Use normal serviceRequest format for SGS create attachment
Merge pull request #931 from daf/sgs_attach_servicerequest

Use normal serviceRequest format for SGS create attachment