def get_record(identifier, opts = {})
      opts[:identifier] = identifier
      opts = @opts.merge(opts)
      @record_class.build(mint_id(identifier),
                          record_xml(client.get_record(opts).record))
    end
def get_record(identifier, opts = {})
      opts[:identifier] = identifier
      opts = @opts.merge(opts)
      @record_class.build(mint_id(identifier),
                          record_xml(client.get_record(opts).record))
    end
Gets a single record with the given identifier from the OAI endpoint

 @param identifier [#to_s] the identifier of the record to get
 @param opts [Hash] options to pass to the OAI client