PLA-1139 List top articles from wikia by views + unit tests.
PLA-1139 swagger docs
PLA-1139 Fixed code elegance, docs and reduced cache to 24h
PLA-1139 cache key function call
PLA-1139
Merge remote-tracking branch 'origin/PLA-1139' into sony-backup

Conflicts:
	includes/wikia/api/swagger/ArticlesApiController.swagger.php
	includes/wikia/nirvana/WikiaResponse.class.php