Send full html document model instead of text

[achempion]

closes #50

This PR allows to get full quill's document model instead of just stripped text.

Before changes

%{
  "data" => %{
    "quill" => %{
      "content" => "hello world",
      "type" => "Text"
    }
  }
}

After changes

%{
  "data" => %{
    "quill" => %{
      "content" => [
        %{"insert" => "hello "},
        %{
          "attributes" => %{
            "background" => "#f8f8f8",
            "bold" => true,
            "color" => "#434343"
          },
          "insert" => "world"
        },
      ],
      "type" => "Text"
    }
  }
}

[achempion]

Probably we can add this into the current version by having it with a new key instead of Text, like quill or something.