Updated NEWS
Updated UPGRADING
Make DOMNode::textContent writeable
Fix ZTS build
Reintroduce fix from pull #770 in a PHP 7 way
Merge branch 'PHP-5.6'

* PHP-5.6:
  Make DOMNode::textContent writeable
  Updated UPGRADING
  Updated NEWS

Conflicts:
	ext/dom/attr.c
	ext/dom/characterdata.c
	ext/dom/document.c
	ext/dom/node.c
Updated NEWS
Updated UPGRADING