Fails entirely if an array of params is passed instead of a hash

[joshgoebel]

payload = [
  ["task[title]", "This is the title"],
  ["task[attachments][][file]", File.open("test.png")],
  ["task[attachments][][file]", File.open("test2.png")],
]
post("/tasks/new", :query => payload)

Inside HTTParty body fails to call query_string_normalizer at all if it's not dealing with a hash... so the files get "converted" to raw inspect strings (i.e., "#<File ...>") and passed over the wire as such - which of course isn't going to work.

Replacing the array with the equivalent hash solves the issue but since array is a supported way of passing params this should probably "just work" properly without users needing to change the class of the params.

Thoughts?