normalize fails on nested array of hashes

[aac]

OAuth::Helper#normalize fails when one of the params is an array of hashes, e.g.

params = {
  'items' => [{'a' => 1}, {'b' => 2}],
}

It calls sort on the Array of Hashes, which fails. normalize_nested_query would work, but isn't called.

[pboling]

Good catch. Fixing.