PNGWriter 2.1 Released

This is a bug fix for alpha channel blending as submitted by Jan.

WriteableBitmap in Sivlerlight uses pre-multiplied values for the colors when there is transparency involved (see MSDN Article), so PNGWriter must de-multiply the values.  unfortunately this is not a lossless process so the colors will be a little bit off, but it should not be noticeable to end users.

Thanks Jan!

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