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)
ADEN-948 Better handle outliers #2
keep eventName in category
1st dart-via-liftium's iframe aint got liftium tag id
PLA-1055 Wikia mobile Search i18n fix

+ switch to non deprecated wfMessage
CON-713 | WHP changed ja translations
CON-713 | WHP cominty image fixed in ja
ADEN-975 Limited fluid layout