Json array parsing

[YaYaB]

When a json array is inside a json object, the parser may fail.
The current implementation was made so that the order of fields in the json array would be in alphabetical order. It's useful only for debugging.

For example let's take the following

{"history":[{"field_1":[{"subfield_1":"test_1"},{"subfield_1": "test_2"}], "field_2":{"subfield_2":"test_3"}}]}

Here is what we obtain:

"[{""field_1"": ""[{""subfield_1"": ""test_1""},{""subfield_1"": ""test_2""}]"", ""field_2.subfield_2"": ""test_3""}]"

We would have wanted to obtain a list and not a string containing a list

[YaYaB]

Fixed by #15