Zend Form requires ServiceManager but doesn't require it (Fatal Error)

[markkimsal]

running
composer require -vvv zendframework/zend-form
will result in an immediate fatal error on your project.

Fatal error: Class 'Zend\ServiceManager\AbstractPluginManager' not found

autoload/formElementManagerPolyfill.php uses Zend\ServiceManager\ServiceManager but this package is not required in the composer file, it is merely suggested.

[Ocramius]

Probably time that we simply add the dependency, rather than polyfilling it...

[froschdesign]

Duplicate of #72