DDC-2770: [GH-833] Generate-Entities-Console-Command: Adding an 'avoid backup' flag

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of ronanguilloux:

Url: #833

Message:

Introducing a new "avoid creating backup files" flag in the existing command-line options list:

$ /console orm:generate-entities src/ --nobackup;

Scope: Allowing cli user to avoid the default backup file generation (new ~EntityName.php file every time),
which is default behavior for now.

= adding only 5 lines to lib/Doctrine/ORM/Tools/Console/Command/GenerateEntitiesCommand.php.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-833] was closed:
#833

[doctrinebot]

Issue was closed with resolution "Fixed"