Couch module updates

- Update sync method to build only views needed for ingestion
- Update backup process to log progress and to use bulk posts
  rather than replication
- Update pagination method to take in include_docs as a param
- Rename export_database view to include dpla_db
- Remove comments from dpla_db_all_for_downloading file to avoid
  error when reading in sync method
Merge branch 'release-v3.5'