Dev fix - incorrect fix for the API extend method before. Was looking
its own reference
Api: Column selector - jQuery selector as a string, an name selector
with :name postfix.

- Previously you could use a jQuery selector for columns by using the
  :jq postfix, and names were matched otherwise. This is reversed now
  for consistency with the rows and cells selectors which treat strings
  as jQuery selectors without the :jq postfix.