Add primary lookup field to oai_datacite Publisher

[Toni Sissala]

The primary lookup field should be Study.distributor instead of Study.publisher. Add a primary lookup field.

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This issue is related to https://bitbucket.org/cessda/cessda.cdc.aggregator.oai-pmh-repo-handler/issues/31/add-secondary-lookup-location-for

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[Toni Sissala]

Add primary lookup to oai_datacite Publisher from study.distributors

Use study.distributors as a primary lookup source to populate oai_datacite Publisher. The secondary lookup is study.publishers, which was the only source.

Add changed-item to 1.0.2 changelog entry.

Fixes #35 at BB.

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