#690: HTTP API documentation for project and other updates.
#550: making it clear we are delivering metadata only. Clenaup.
updated date
re-added OAI set for projects
updated oxygen project with the correct tree structure
Added and commented property to generate output in chunks
mvn generates output with no chunks in a single file: api-doc.html
Main docbook file renamed from book.xml to api-doc.xml
updated OAI-PMH sets: now delivering only results and no other entities.