Create new gulpfile.js

I work with gulp and my old config isn't working that great anymore. I need someone to set up a new one that achieves a few things I will list out (convert PX to REM, minify code, add prefixes etc) I will give you my current [login to view URL] file and I just need it updated to work the same way but more efficiently. I currently get a few deprecation errors that aren't making sense to me. To prove you've read this, please let me know that you understand gulp when you message me. Thanks