Send ban reason along with ban events in chat
remove ad_cat and some other unused code, add city_hubs schema
changed vertical to hub, refactored WikiFactoryHub and some callers
add/remove/update categories, clear cache on changes
fix getVerticalId query
audit/update WikiFactory::getCategory and getCategories
PLA-1641 adding "ref" support to API urls
PLA-1641 docs and cleanup
PLA-1641 Added unit tests
PLA-1641 cleanup
PLA-1641 cleanup
PLA-1641 missing urls
Merge branch 'PLA-1641' into PLA-1641b

Conflicts:
	extensions/wikia/WAM/controllers/api/WAMApiController.class.php
PLA-1641b unit tests cleanup
PLA-1641b unit tests cleanup
PLA-1641b unit tests cleanup
PLA-1641b code cleanup
CON-1284 implement hacky way of changing event sampling for qualaroo surveys
CON-1284 CR fixes
CON-1395: Support for hub corporate pages on wikia home page