Overview of changes for 0.6.0
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* Allow deserialization of strings into enum and flag types
* Add the :indent-char property to JsonGenerator
* Add functions to retrieve copies of the nodes inside Object and Array
* Fix leaks and invalid accesses
* Use the right type for the buffer length parameter in JsonParser
* Provide a default implementation for JsonSerializable
* Provide our own JSON tokenizer (using GScanner) for the JSON-only
  features that would have been lost by using GScanner
* Add a fully automated test suite, using the GTest framework
* Allow 'null' nodes to return a value without warnings
* Add support for parsing Unicode characters escaped using \uXXXX
* Make the deserialization of G_TYPE_STRV properties more robust
* Export the public symbols only
* Provide GTypes for the enumerations
* Avoid a warning when trying to copy an empty JsonNode
* Fix gtk-doc cross-references with GLib and GObject documentation
 
Overview of changes for 0.4.0
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* Support parsing of negative numbers
* Fix parse error propagation and message
* More parser sanity checks
* GObject deserialization support
* Detect and parse JSON masked as a JavaScript assignment
* Allow using JsonNode with GObject properties and signals
* Add JsonGenerator:root property