* change API to /api/queries/:id/dropdowns/:dropdown_id
* extract property
* split to 2 different dropdown endpoints and implement the second
* make access control optional for dropdowns (assuming it is verified at a
different level)
* add test cases for /api/queries/:id/dropdowns/:id
* use new /dropdowns endpoint in frontend
* require access to dropdown queries when creating or updating parent
queries
* rename Query resource dropdown endpoints
* check access to dropdown query associations in one fugly query
* move ParameterizedQuery to models folder
* add dropdown association tests to query creation
* move group by query ids query into models.Query
* use bound parameters for groups query
* format groups query
* use new associatedDropdowns endpoint in dashboards
* pass down parameter and let it return dropdown options. Go Levko!
* change API to /api/queries/:id/dropdowns/:dropdown_id
* split to 2 different dropdown endpoints and implement the second
* use new /dropdowns endpoint in frontend
* pass down parameter and let it return dropdown options. Go Levko!
* fix bad rebase
* add comment to clarify the purpose of checking the queryId
