Add "role" to $validGlobalAttributes

See http://www.w3.org/html/wg/drafts/html/master/dom.html#wai-aria
added zendframework/zend-cache as suggest dependency at Zend\Memory
to support swap the memory objects
remove zendframework/zend-stdlib from suggest dependency at Zend\Loader\composer.json
because it not used at this component
Merge pull request #5285
Merge pull request #5285 in master
Merge pull request #5284 from samsonasik/add.zendcache.atmemory

added zendframework/zend-cache as suggest dependency at Zend\Memory