Try to make bitmaps work.
Merge branch 'nat' of https://github.com/mozilla/shumway into nat
Fix issue when setting width / height on an object that is not added to the stage yet.
Make DataBuffers deal with buffers whose length is not a multiples of 4.
better alignment of frame labels in FF

https://bugzilla.mozilla.org/show_bug.cgi?id=737852#c6