DAR-1717: Implement solution on WikiaHomePage
DAR-1717: WikiaHomePage: Hub images
DAR-1717: Refactor ImagesService::overrideThumbnailFormat
DAR-1717: Typo
DAR-1714: Refactor ImagesService and use it in Masthead and AvatarService
DAR-1714: Use AvatarService in Achievements extension
DAR-1714: Use AvatarService in Answers extension
DAR-1717: Fix after refactoring
Make ImagesService::allowedExtensionList return static array
Typo
DAR-1717 Change Wiki images served from WikiService to JPG instead of PNG

The transparency is not used, and bandwith consumption will be ~75% lower.
DAR-1717 Spacing adjustments
DAR-1896 | ImageService refactoring unit tests
Merge branch 'DAR-1714-and-1717' of github.com:Wikia/app into DAR-1714-and-1717
Fix typo and don't add extension if it's already there
DAR-1717 | Add extension param to getLocalFileThumbUrlAndSizes
DAR-1717 | Fix hubs
DAR-1717 | Missing param
DAR-1717 | Clarify description
DAR-1717 | Clarify more ;)