PromoteImageReviewTask

@scottrabin 
This task suffered from being executed on wikis that didn't have the required extensions enabled. This refactor makes it pretty much exactly like https://github.com/Wikia/app/blob/dev/extensions/wikia/ImageReview/modules/PromoteImage/PromoteImageReviewTask.php.
This file also needs the [stylize script](https://github.com/Wikia/guidelines/tree/php-coding-conventions-githook/PHP) run over it.