Fix requirements.txt for non windows users

[xeloader]

This will skip the windows dependencies for mac and linux users, had some trouble with it, hopefully it will help someone! Found the solution at https://stackoverflow.com/questions/16011379/operating-system-specific-requirements-with-pip

[mathematicalmichael]

NICE! I always wondered how to do that but never cared to learn.

I would suggest removing the requirements_dockerfile.txt file that got meged in and making the associated change in the Dockerfile

[xeloader]

Good point! Done and done!

[voidstar0]

Thanks a ton!