Resolve encoding issues with arrays of hstore (bug 11135).

We didn't have enough encoding for the wire protocol to store an array
of hstore types. So, further encode any hstore that is an array member.
Whilst we're here, ensure it's an HashWithIndifferentAccess being
returned, to be consistent with other serialized forms, and add testing
for arrays of hstore.

So now the following migration:

  enable_extension "hstore"
  create_table :servers do |t|
    t.string  :name
    t.hstore  :interfaces, array: true
  end

produces a model that can used like this, to store an array of hashes:

  server = Server.create(name: "server01", interfaces: [
    { name: "bge0", ipv4: "192.0.2.2", state: "up" },
    { name: "de0", state: "disabled", by: "misha" },
    { name: "fe0", state: "up" },
  ])

More at http://inopinatus.org/2013/07/12/using-arrays-of-hstore-with-rails-4/

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