Added support for arbitrary operators to Query::filterWhere, added support for arbitrary operators to Sphinx extension

Update MessageController.php

Fixed order of checking config `format` property

- Removed `FileLoader` and used `\Twig_Loader_Filesystem` instead.
- Added support of Yii's aliases.
- Added `set()` that allows setting object properties.

Conflicts:
	framework/CHANGELOG.md

Refactored ActiveQuery::one() to be consistent with all() creation

Added tests that are making sure Gii isn't failing with errors

- Enh #4520: yii\caching/MemCache.php add sasl support (xjflyttp)

Fix signature validation

Updated guide