Fixes #4324: removed old way of developing Yii from the docs since app/link is much better/simpler workflow
Fixes #4298: Renamed framework/messages/pt-PT to framework/messages/pt in order to allow fallbacks
avoid confusion about uploadRequired
Fixes #4297: Added check for DOM extension to requirements
Update README.md

fixed outdated example.
OAuth extension adjusted to support any custom request type.
Redundant `yii\authclient\OpenId::sendStreamRequest()` removed.
Merge branch 'master' of git://github.com/yiisoft/yii2 into 4317-absolute-auth-timeout

Conflicts:
	framework/CHANGELOG.md