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
revert changes to Analytics_Urchin js
change self to this
fix dumb syntax errors
fix column name
revert another reference to getVerticalId
Merge pull request #4130 from Wikia/PLATFORM-267

Platform 267 Here we go!