code style
Merge branch 'master' of github.com:yiisoft/yii2

* 'master' of github.com:yiisoft/yii2:
  Make code coverage work
  Note about  embedded documents added to mongodb extension readme
  yii\mongodb\file\Collection::ensureMongoId() fixed to suppress exception on invalid _id format.
  yii\mongodb\file\ActiveRecord::update() fixed to save the attributes while updating file.
  Fixes #2661: Added boolean column type support for SQLite
  Refactored controller creation process.
  Added back some toArray() implementations.
  Fixed test break.
  Update console-migrate.md
  Fixes #2655: Arrayable and ArrayableTrait are incompatible for some PHP versions.
  Fixes #2659
  Minor code style fixes for apidoc
  Changed assertions
  fix tests
api doc improvements