http://www.php-fig.org/psr/psr-4/
http://www.php-fig.org/psr/psr-0/
http://alanstorm.com/laravel_composer_autoloading
http://alanstorm.com/composer_autoloader_part_1
http://alanstorm.com/composer_autoloader_features_part_2
http://daylerees.com/composer-primer