Merge pull request #129 from ozone-development/mp-integration

fix: Persist data from data.api to Marketplace back-end
fix: Stringify entity when persisting to back-end

Code to stringify entiry being persisted was inadvertently left out of previous commit.

refs #95
fix: Create resource key for entities in data.api

DataApi was creating resoruce key 'data' for all entities. Now it uses the entity's key as the resource key.

refs #95
build with latest IWC code