Fix demos to use 'transform' rather than '-webkit-transform'

From ec44a2bdc0a6220435cd7079e3b6546f3fa997ad onwards, the polyfill only
accepts 'transform'.
(cherry picked from commit 9d90027b1ff89a69f26a3adff1760a43881a30fc)

Signed-off-by: Douglas stockwell <dstockwell@chromium.org>
Fix test-circle-square.html demos after removal of parent argument from TimedItem constructors

See b2dda9802d9710a0b0563aaf478d0bfd584e3f6f
(cherry picked from commit b3879636cb50ba37550fcc0aa5b1234fd14c0a46)

Signed-off-by: Douglas stockwell <dstockwell@chromium.org>
Update README.md and demos after change to KeyframeAnimationEffect

See 6a4d32eedc089e0b69b3b6f9201523bdf47d5313
(cherry picked from commit 1c9cb37c58eeeaacffe61ddfb4532b0fec964471)

Signed-off-by: Douglas stockwell <dstockwell@chromium.org>