Added IceFramework (http://www.iceframework.org/)

Simple and fast PHP framework delivered as C-extension.

README.md

 * [PPI Framework 2](http://www.ppi.io) - An interoperability framework.
 * [CakePHP](http://cakephp.org/) - A rapid application development framework.
 * [Phalcon](http://phalconphp.com/en/) - A framework implemented as a C extension.
+* [Ice](http://www.iceframework.org/) - Another simple and fast PHP framework delivered as C-extension.
 
 ## Framework Extras
 *Extras related to web development frameworks.*