Allow skipping params key if using finder without symbol

If finder is used without a predefined symbol (like :all, :one, etc), can we just assume the entire options is for params? I think this should further be modified to just drop params in general but I haven't look at all cases yet.

Instead of:
  StreetAddress.find(1, :params => { :person_id => 1 })

You can now write:
  StreetAddress.find(1, :person_id => 1)