Packaging

[wilhelmhb]

Allow the PerceptualLoss to be installed as a package, and reused.
#39 forces us to call python setup.py.
#13 has not been updated for more than a year.

The package will include the README and the weights.

I also fixed some dependencies, and cleaned a part of the code.

[mameli]

As long as the author has not indexed the package in PyPI, isn't the command python setup.py install the easiest way to install this repo? pip install perceptual-similarity-pytorch is not working right now
p.s. Good job on the code refactoring

[wilhelmhb]

pip install perceptual-similarity-pytorch is the command for installing the package once it has been published to PyPI.
The easiest way to install this repo is pip install -e /path/to/repo, from anywhere else. The -eoptions will reflect changes from the source code, thus you should not need to reinstall the repo each time you change something.

[smsegal]

@wilhelmhb Oh darn I just redid a bunch of this packaging work on my own, I should have checked the PR's first. You haven't published to PyPi correct? I'll just be installing this from your fork then.

[wilhelmhb]

@smsegal no, I haven't published to PyPi. I wanted to let the owner of the original repo do it, as it's not my own code ;)

Glad my contribution is useful to someone =)

[richzhang]

I finally got around to making a pip install. Thanks for your PR; I added you to the readme