Merge branch 'master' into patch-3

Author: dobooth

src/guides/v2.3/extension-dev-guide/cli-cmds/cli-howto.md

@@ -50,6 +50,15 @@ Before you begin, make sure you understand the following:
    </config>
    ```
 
+   or in the `__construct` method (declaration is similar to `di.xml`):
+
+   ```php
+   public function __construct()
+   {
+       parent::__construct('my:first:command');
+   }
+   ```
+
    Otherwise the [Symfony](https://github.com/symfony/console/blob/master/Application.php#L470) framework will return an `The command defined in "<Command class>" cannot have an empty name.` error.
 
 ## Add CLI commands using dependency injection {#cli-sample}