[DX] Re-work generate:bundle for simple app bundles #290

@weaverryan please review my pull request ;)
the first line, for example, should be:

```php
array(array('--dir' => $tmp, '--format' => 'annotation', '--shared=true'), "Foo/BarBundle\n", array('Foo\BarBundle', 'FooBarBundle', $tmp.'/', 'annotation', false)),
```

I removed `true` from the third argument (which is *not* the input, but is used for asserting things) and passed `--shared` just as an option. This makes it not hang :)