HTML_CSS : The Definitive Guide

Added the ability to parse CSS from string with HTML_CSS::parseString()

Added the ability to parse CSS from file with HTML_CSS::parseFile()

Added the ability to generate CSS and store it in a file with HTML_CSS::toFile()

Introduced error handling system with PEAR_ErrorStack.

Added unit tests with PHPUnit 1.x for API and bugs.

Retrieve the settings of individual properties