DAR-1063: Preparation for Special:CSS release

Special:CSS page is a simple editor with errors notifications and highlighting for Wikia.css file. It'll be accessible for wiki admins via Special:AdminDashboard. Except editing the page have also section of "CSS Updates" which are information pulled from blog posts on community wikis: EN, PL, DE, FR, ES, RU, IT. If a user language isn't one from the group she'll get information from English community wiki.

Highlights:
* @lgarczewski @mroszka @kamilkoterba I'll create jira issue for l10n review but there is only one file: [SpecialCss.i18n.php](https://github.com/Wikia/app/pull/1090/files#L33R1),
* we added few hooks: [SpecialCssHooks.class.php](https://github.com/Wikia/app/pull/1090/files#L13R1),
* @lukaszkonieczny [fixed issues with URLs](https://github.com/Wikia/app/pull/1090/files#L22R1040) on devboxes and it was reviewed by @macbre,
* there were core changes to pull data from master: [1](https://github.com/Wikia/app/pull/1090/files#L24R529), [2](https://github.com/Wikia/app/pull/1090/files#L25R3905),
* @themech [added support for condition 'notSkin'](https://github.com/Wikia/app/pull/1090/files#L27R457) parameter,
* ACE library was added as well: [1](https://github.com/Wikia/app/pull/1090/files#L16R6), [2](https://github.com/Wikia/app/pull/1090/files#L33R1),
* [connected Wikia/config pull request](https://github.com/Wikia/config/pull/161)

@owend @federico-lox any comments are welcome @wladekb performance comments are even more welcome ;)