add delete link to special:listfiles entries
fix link, change to delete link to lowercase
some changes per code review
Xml -> Linker
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
CON-1379: Added Handlebars library
CON-1379: Added Handlebar Engine
PLA-1641 missing urls
Merge branch 'PLA-1641' into PLA-1641b

Conflicts:
	extensions/wikia/WAM/controllers/api/WAMApiController.class.php
CON-1379: Support handlebars partials
PLA-1641b unit tests cleanup