Added phpdoc_separation fixer

The idea here is to go from:

```php
    /**
     * @param EngineInterface $templating
     * @return void
     */
```

to 

```php
    /**
     * @param EngineInterface $templating
     *
     * @return void
     */
```
This should work, but feels horrible!

```php
$split = preg_split('/([\n\r])/', $content, -1, PREG_SPLIT_DELIM_CAPTURE);

$lines = array();
$key = 0;
while (true) {
    if (array_key_exists($key + 1, $split)) {
        $lines[] = implode(array($split[$key], $split[$key + 1]));
        ++$key;
    } elseif (array_key_exists($key, $split)) {
        $lines[] = $split[$key];
        break;
    } else {
        break;
    }
}
```