Updated pull request with three separate ontologies for repository, rest-api and relations.

This pull request splits the repository, rest-api and relations into three separate ontologies with different base URIs:

* repository: http://fcrepo.org/repository#
* rest-api: http://fcrepo.org/repository/rest-api#
* relations: http://fcrepo.org/repository/relations#

It also add many of the properties currently present in the REST API.