Support or documentation for custom field values

[panozzaj]

Hi, I was trying to see in the library if there's a way to query a list for cards, and include custom field types. For example, I'm following the instructions at https://developers.trello.com/reference#section-nested-cards-as-query-params and would like to pass customFieldItems=true in the query params. When I search the codebase for customField I don't see anything that seems to do this though. Possible I missed it or there's some kind of metaprogramming happening.

Wanted to open this in case I missed the documentation or as a placeholder for this feature. Seems somewhat related to #255 but for queries instead of updates (although we could use that too... rolling our own by hand based on that issue.)