Added possibility to render view with short reference (added RelativeFallbackResolver).

It makes add rendering view the same as php include file which contains
in the same folder.

Now possible use short form to look up in the same folder. If we are in view with template name `'very-long-view-top-name/very-long-view-top-name2/any-name'` we can use:

```php
$this->render('bar');   // like include 'bar.phtml';
// instead of
// $this->render('very-long-view-top-name/very-long-view-top-name2/bar');
```

should exist map resolver: 
```php
     'very-long-view-top-name/very-long-view-top-name2/bar' => 'foo/baz',
```
or the same path resolver.