Added ability to compose collections via Zend Form annotations

[carnage]

This patch resolves issue #5410

[weierophinney]

CS -- wrap the operators (? and :) with spaces.

[carnage]

It's not visible from the diff, but the method already checks that further up

 public function handleComposedObjectAnnotation($e)
    {
        $annotation = $e->getParam('annotation');
        if (!$annotation instanceof ComposedObject) {
            return;
        }

        $class             = $annotation->getComposedObject();
        $annotationManager = $e->getTarget();
        $specification     = $annotationManager->getFormSpecification($class);

        $name        = $e->getParam('name');
        $elementSpec = $e->getParam('elementSpec');
        $filterSpec  = $e->getParam('filterSpec');

        // Compose input filter into parent input filter
        $inputFilter = $specification['input_filter'];
        if (!isset($inputFilter['type'])) {
            $inputFilter['type'] = 'Zend\InputFilter\InputFilter';
        }
        $e->setParam('inputSpec', $inputFilter);
        unset($specification['input_filter']);

        // Compose specification as a fieldset into parent form/fieldset
        if (!isset($specification['type'])) {
            $specification['type'] = 'Zend\Form\Fieldset';
        }
        if ($annotation->isCollection()) {
            $elementSpec['spec']['type'] = 'Zend\Form\Element\Collection';
            $elementSpec['spec']['name'] = $name;
            $elementSpec['spec']['options'] = new ArrayObject($annotation->getOptions());
            $elementSpec['spec']['options']['target_element'] = $specification;

            if (isset($specification['hydrator'])) {
                $elementSpec['spec']['hydrator'] = $specification['hydrator'];
            }
        } else {
            $elementSpec['spec'] = $specification;
            $elementSpec['spec']['name'] = $name;
        }
    }

The whole method for reference

[weierophinney]

Merged to develop for release with 2.3.0.