Use official PHP Term "Qualified Class Name" and remove invalid rule regarding FQCN

Recommend the official PHP term "qualified class name" over inventing a new term of "autoloadable class name." The PHP definition for "qualified class name" is useful. Please see [Namespaces Name resource] rules (http://php.net/manual/en/language.namespaces.rules.php)

Removed rules requiring the conforming autoloader resolve a FQCN since PHP never sends the spl_autoloader a FQCN. PHP sends it a QCN. (Please see gist in previous commit for working example demonstrating this fact.)