File upload

Removed tests and support for AR 3.0. With Ruby 1.9 it doesn't play nice. It returns strings in ASCII encoding instead of UTF-8. There is not much value added to support AR 3.0 any longer. But I think it is okay for now to keep AR 3.0 magic workarounds around in the code.

From now on cruise runs the tests with Ruby 1.9.3.

http://cruise.infopark:3000/project/show_build/18908
all green

Changelog entries added.