(#238) - parallelize getAttachment()
(#238) - parallelize getAttachment()

nicolasbrugneaux/express-pouchdb,nicolasbrugneaux/express-pouchdb,tyler-johnson/express-pouchdb,pouchdb/pouchdb-server,tyler-johnson/express-pouchdb,pouchdb/pouchdb-server,tyler-johnson/express-pouchdb,nicolasbrugneaux/express-pouchdb