test typo fix

Yii2 advanced tests fixed

Changed markdown library to cebe/markdown

- supports GFM now
- allows defining different flavors

fixes #47

Minor formatting bug in README.md

Update advanced/README.md

Changed spaces to tabs

Merge branch 'yii2_advanced_app_codeception' of github.com:Ragazzo/yii2 into Ragazzo-yii2_advanced_app_codeception

Conflicts:
	apps/advanced/README.md

fixes #2466

Update README.md

to require newly released stable version of phpdoc reflection library

Use 'Yii::$app->request->post()' instead of $_POST

Consistent column naming