Feature Request: Enable stdin, stdout and stderr support

[greggreenhaw]

It sucks to have to write images to the file system before resizing. Can you enable the ability to pass buffers in directly?

[wwlinx]

probably won't have time to look at this anytime soon unfortunately...

[mal]

+1 for streams

[gendalf]

+1 streams will useful feature

[kadishmal]

+1.

[korzhyk]

+1