Raise error if binder contains a document not in authoring

This only happens if the id ends with "@draft"
Add "state" and "publication" metadata fields
Publish documents to archive using cnx-publishing
Add header x-api-key when using the publishing api for trusted access
Publish binders to archive using cnx-publishing
Merge pull request #40 from Connexions/publish-documents

Publish documents
Fix memory storage
Merge pull request #41 from Connexions/fix-memory-storage

Fix memory storage
fix C&P error in authentication wrapper
Fix view tests after update in authentication check (50c5b71)
Set title overrides when creating a binder
Publish abstract to cnx-archive
Merge pull request #42 from Connexions/publish-with-abstract

Publish abstract to cnx-archive
Merge pull request #43 from Connexions/add-title-overrides

Add title overrides