addSelect method for Query

fixes #3028

Fixed typo in phpDoc for findAll function

New addSelect method. Useful for scopes.

Wrong placeholder in translation

Authorization auth guide fix

Refactored AR find to fix #2999

Pretty awesome feature!

Update logging.md

Note: should confirm that my additions of “inclusive” is correct.

Still feels like an incomplete, possibly unnecessary, fragment

Because we’re using capital “Web” not “web” (my previous mistake).

Clarify new usage of yii\web\View::render()

One paragraph description and one code snippet to clarify usage of yii\web\View::render() in a view context, as using echo is a significant change from partial view usage in Yii 1.1.