specify params with a more CoffeeScripty idiom, #2

non-specific brackets is preventing proper json parsing from js object. this will allow the parser to run and makes it more specific what is being passed to `findAllLive` by matching query-engine's arguments declarations

* https://github.com/bevry/docpad/blob/master/src/lib/docpad.coffee#L366
* https://github.com/bevry/query-engine/blob/master/src/documents/lib/query-engine.js.coffee#L501-L503