wp-cli/wp-cli — pull request #396 by scribu (2013-04-26 17:43:39+00:00)
Title: Don't instantiate single command classes

i.e.:

```php
WP_CLI::add_command( 'search-replace', new Search_Replace_Command );
```

should just be:

```php
WP_CLI::add_command( 'search-replace', 'Search_Replace_Command' );
```