AutoTimestamp field renaming
Advanced app User model updated
Advanced app migrations updated
Guide updated
AutoTimestamp updated
Sort updated
BaseArrayHelper updated
Unit tests updated
Added hints for defining AR relations to docs
CHANGELOG
CHANGELOG typo fix
Merge pull request #2057 from creocoder/auto-timestamp-field-renaming

AutoTimestamp field renaming
advanced file excluding/including ported from git
Added info about using debug module with enableStrictParsing enabled
code style
Some Code style fixes
Missing codestyle fix
Merge pull request #2061 from lucianobaraglia/some-codestyle-fixes

Some codestyle fixes
more null fixes.
Fixes #2063: Removed `yii\web\Request::acceptTypes` and renamed `yii\web\Request::acceptedContentTypes` to `acceptableContentTypes`.
Renamed `yii\web\Request::acceptedLanguages` to `acceptableLanguages`