Fix for bad json type, json from JSON.decode can be either Map or List
Exported vane_model so that you don't need to import vane_model explicitly on the server-side, you only need to import vane.dart and vane_model is included. On client-side only vane_model.dart is imported (vane.dart can't be imported client-side since it use dart:io.
Added VaneModel
Changed behavior of 'return next()' if part of a middleware pipeline (see CHANGELOG.md for details.