Added no-backup command to document generator command line tool

fixed option name and type

Author: klongmitre

lib/Doctrine/ODM/MongoDB/Tools/Console/Command/GenerateDocumentsCommand.php

@@ -76,6 +76,10 @@ protected function configure()
             new InputOption(
                 'num-spaces', null, InputOption::VALUE_OPTIONAL,
                 'Defines the number of indentation spaces.', 4
+            ),
+            new InputOption(
+                'no-backup', null, InputOption::VALUE_NONE,
+                'Flag to define if the generator should provide a backup file of exisiting code.'
             )
         ))
         ->setHelp(<<<EOT
@@ -135,6 +139,7 @@ protected function execute(Console\Input\InputInterface $input, Console\Output\O
             $documentGenerator->setGenerateStubMethods($input->getOption('generate-methods'));
             $documentGenerator->setRegenerateDocumentIfExists($input->getOption('regenerate-documents'));
             $documentGenerator->setUpdateDocumentIfExists($input->getOption('update-documents'));
+            $documentGenerator->setBackupExisting(!$input->getOption('no-backup'));
             $documentGenerator->setNumSpaces($input->getOption('num-spaces'));
 
             if (($extend = $input->getOption('extend')) !== null) {