Running Waifu2x Operations in Parallel

[OstrichRider]

This is more of an optimization/feature request than an issue but I didn't know where else to post it. On my system (i5-3330, GTX 980), I've found the sweet spot for saving time is to split up my image workload into 3 different folders and run three instances of Waifu2x-caffe at the same time on those folders. So I was thinking why isn't the option to work on multiple images at the same time built-in? I'd imagine the program could even automatically detect the fastest number of parallel operations to run based on system resources.

[rlaphoenix]

https://github.com/imPRAGMA/W2XKit Enjoy!