first draft of the extension generator

Raw content return for Grid DataColumn & Column

Fixes #2544: Changed `DetailView`'s `name:format:label` to `attribute:format:label` to match `GridView`

Merge branch '2524-formatter-format-file-size' of github.com:VinceG/yii2 into VinceG-2524-formatter-format-file-size

Conflicts:
	framework/CHANGELOG.md

close #2543

fixes #2220

added a missing argument

No need for it anymore.

travis seems to be really slow currently...

Fixes #2527: Source language for `app` message category was always `en` no matter which application `sourceLanguage` was used

ActiveRelationTrait:: __clone() doesn't call parent (Component::__clone())

Pjax container fix

Update authorization.md

fixed typo in one of the RBAC TYPE_OPERATION examples.