def library_combined_document(library_document_id, file_path=nil, auditReport=false)
      response = Echochamber::Request.library_combined_document(token, library_document_id, auditReport)
      unless file_path.nil?
        file = File.new(file_path, 'wb')
        file.write(response)
        file.close
      end
      response
    end
def library_combined_document(library_document_id, file_path=nil, auditReport=false)
      response = Echochamber::Request.library_combined_document(token, library_document_id, auditReport)
      unless file_path.nil?
        file = File.new(file_path, 'wb')
        file.write(response)
        file.close
      end
      response
    end
Retrieves library combined document file

 @param library_document_id (REQUIRED)
 @param file_path [String] File path for saving the document.  If none is given, nothing will be saved to disk.
 @param auditReport [Boolean] When set to YES attach an audit report to the library document PDF. Default value will be false.
 @return [String] Raw library combined document file data