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
Correctly parse user.user_birthdate from DB
Add user birthdate to Special:LookupUser
Add i18n messages for Special:LookupUser
Use $wgLang->date() instead of $wgLang->timeanddate()
BAC-576: importWikicities.php

Implement wikicities db sync from production to dev-db-central
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
added placeholder for LyricsWikiCrawler
Added lyrics api DDL schema
Fixed id case