Document _id and metadata options for GridFS upload methods
Document _id and metadata options for GridFS upload methods

mongodb-labs/mongo-php-library-prototype,mongodb/mongo-php-library,jmikola/mongo-php-library-prototype,mongodb/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,derickr/mongo-php-library,derickr/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library,derickr/mongo-php-library-prototype,10gen-labs/mongo-php-library-prototype,mongodb/mongo-php-library,jmikola/mongo-php-library