PHPCS fixes for Zend\Dom
Merge branch 'cs/#6699-zend-dom-psr-2-compat'

Close #6699
Trying to fix #6768: allowing false values in PriorityList
Merge git://github.com/Grundik/zf2 into hotfix/prioritylist

Conflicts:
	library/Zend/Stdlib/PriorityList.php