adamwathan/form — pull request #11 by colindecarlo (2014-08-11 23:28:06+00:00)
Title: Add button element

I'm not convinced that Submit should exist anymore, it's really convenient
but you can get the same result easily with

```php
$submit = new Button('Submit');
$submit->type('submit');
```

The form builder `submit` method can do the same thing.