added codeception tests to frontend
modified buttons attributes to skip sf-crawler bug
added codeception to backend
added button attributes to skip sf-crawler bug
added codeception tests to common
added codeception main yaml
added codeception tests to console
added index tests files to application
added guide notes
newlines fixed, code-guy deleted
improved dependencies, guide
removed ordered list
formatting improved
correct lists fixed
removed unnecessary call to Html::url()

fixes #2466
Merge branch 'yii2_advanced_app_codeception' of github.com:Ragazzo/yii2 into Ragazzo-yii2_advanced_app_codeception

Conflicts:
	apps/advanced/README.md
Update advanced/README.md directory structure
Changed spaces to tabs
Merge pull request #2469 from Theill11/update-readmes

Update advanced/README.md
Minor formatting bug in README.md
Merge pull request #2470 from Theill11/patch-1

Minor formatting bug in README.md