[Console] "Building a Single Command Application" solution is not usable for commands with arguments 

The solution proposed in
http://symfony.com/doc/2.2/components/console/single_command_tool.html
does not work if the command accepts an argument.

``` bash
test.php arg1 
```

will throw RuntimeException "Not enough arguments".

I'm not sure if this should be fixed or described in the docs.
