Add $this->pull() component method

[calebporzio]

Often, when using $this->reset(), I have to "use" a value first, then reset it. It would be nice to have a method like $this->pull() that did both operations in one swoop like so:

public $todos = [];

public $todo = '';

public function addTodo()
{
    $this->todos[] = $this->pull('todo');
}