Consider integrating Patrick Mineault's PNGEncoder updates

[darronschall]

Originally filed by darron.schall on 2007-01-09T15:16:13

Patrick Mineault made some changes to Tinic's original PNGEncoder, and
documented them here:

http://www.5etdemi.com/blog/archives/2006/12/as3-png-encoder-faster-better/

He doesn't mention what license the code is released under, so we'll need
to double check that we can integrate his changes. We'll also want to
verify the updates before making any changes to the current version.

[darronschall]

Originally issue from http://code.google.com/p/as3corelib/issues/detail?id=5