niftylettuce/express-cdn — pull request #24 by nozaq (2012-12-06 04:50:28+00:00)
Title: PNG optimizations fail with OptiPNG v0.7 or higher

OptiPNG outputs its activity log to STDERR since [v0.7](http://optipng.sourceforge.net/history.txt).

So with the latest OptiPNG, all png optimizations fail because express-cdn throws an error if something is written to STDERR from an OptiPNG process.