Patch from Moriyoshi Koizumi:

Patch from Moriyoshi Koizumi:

1. making the resulting swf file importable as a runtime shared asset.

  Running with -e <name> creates a movie containing one sprite
  whose contents would all be put in the root if without -e.

  The result will show up in the same way as that with no option.

2. fitting images to the document's bounding box.

  Running with the -f option makes the images to the document's bounding
  box, while they are centered with their original size by default.

3. offseting images by arbitrary distance.

  -x (--xoffset) and -y (--yoffset) options determine the offsets of the
  produced images. For example, offsetting an image by -320px means
  moving the registration point 320px right of the image's left border
  on the screen.