* JSON visitor are located in the format namespace
* Visitor are *real* visitor
* Visitable class has been renamed to Object
* Due to a bug in Visual Studio 2015, we move to VS2017
* Enable bitness through ``LIEF::Header::is_32`` and
``LIEF::Header::is_64` (See #29)
* Add ``modes`` ot the Python API
* Abstract binary object type (executable, library...)