- Add support to 2.2 PostcardCreator REST endpoint (2.0 is Gone).
- Better new lines handling
- Add support to the new 2.0 PostcardCreator REST endpoint
- BC: API change of the `Client.sendPostcard` and introduction of a `Postcard` object.
This new object is responsible of the layout rendering. Can be overrided to change the default template.
- Fix error when no credentials is given
- added support to register new user
- more tests
- Initial version