8dd47e34b9 removed the handling of the
BOMs but did not document it. This brings the behavior back and adds a
unit test so we don't break it again.
Discussed-on: http://lists.qt-project.org/pipermail/development/2014-April/016532.html
Change-Id: Ifb7a9a6e5a494622f46b8ab435e1d168b862d952
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>