This release is a hotfix for the new Flattr API. It especially fixes the OAuth procedure that was broken due to a change in the server response.
This release removes the Apache HttpClient dependency, which fixes certificate issues on older Android versions and also makes flattr4j smaller.
json.org library has been updated to the latest version as well, which required a few code changes as the library is now much stricter about type usage.
AccessToken and ConsumerKey are now immutable objects.