Merge remote-tracking branch 'alexis/deserialization'

Adds deserialization support to serialization framework and the Json
implementation. Also fix wrongful use of `' '` for chars in
generated
Json.

Merged to prevent bug with nitdoc and duplicate modules.

To be done next:

* Support for generic types
* Separate the json_serialization services in 2: pure json and json
* for
deserialization.
* Support NativeArray or its users