zendframework/zf2 — pull request #5141 by Thinkscape (2013-09-19 12:13:00+00:00)
Title: Fix Container::append(), support fluid interface (same as prepend()).

The following should be possible:
````php
// inside view script
$this->placeholder('something')->prepend('foo')->prepend('bar');
$this->placeholder('something')->append('foo')->append('bar');
````

This PR fixes `AbstractContainer::append()` so it supports fluid interface, symmetric to `prepend()`