ArticlesApiController: PHP hinting
ImageServingController: use JSON format by default
ImageServing: cache images with maximum limit

ImageServing::getImages() will take a slice when getting data from cache
ImageServing: mark getThumbnails() as deprecated
Merge branch 'dev' into bac-734-image-serving-results-caching

Conflicts:
	extensions/wikia/ImageServing/drivers/ImageServingDriverBase.class.php
	extensions/wikia/ImageServing/drivers/ImageServingDriverUserNS.class.php
Add some colors to Special:AbTesting page; add general information about currently used GA Slots
Minor changes suggested after in-team Code Review
Minor refactor
Remove zero state of Forum related discussions module
Add scheduled informations
Forgot to sort future GA slots
Obsolete styling in controller
Remove RelatedForumDiscussions zero-state css (VOLDEV-46)
Adding variable indicating the need to show toc
Define toc module and serve the indicator to show it or not
Actually change require to define
Styleguide for modal.js
Modify toc so it doesnt show when not needed
Initialize toc as soon as possible
Styleguide for events.js