[WIP] Fixer that converts old style constructors into __construct()

Please share your thoughts on this fixer.

I need to implement ignoring of oldstyle constructors in namespaced classes (added in PHP 5.3.3), and the fixer should be done.

I'm wodndering if there are some more rules that i should consider in this fixer?
you calling `getMethodByName` here twice - first hidden in `hasMethodNamed`, second here.
no need to.

```php
$index = $this->get(...

if (null === $index) {
    continue;
}

...
```