Fix url

Enh #4581: Added ability to disable url encoding in `UrlRule`.

fix typo in define $flavors['gfm-comment']

fix typo Markdown->GithubMarkdown in $flavors['gfm-comment']

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