Add component suggestions.

README.md

 * [Symfony2 Components](http://symfony.com/doc/master/components/index.html) - The components that make Symfony2.
 * [Zend Framework 2 Components](https://packages.zendframework.com/) - The components that make ZF2.
 * [Aura Components](http://auraphp.github.com/) - A package of PHP 5.4 components. 
+* [Hoa Project](https://github.com/hoaproject) - Another package of PHP components.
 
 ## Micro Frameworks
 *Micro frameworks and routers.*