refactoring + autoresize + multiple comparison

[koteth]

I’ve done a small refactoring for myself.
I’ve also enabled the possibility to compare an image against a list (directory) of images.
if you pass 2 images as input the output is the same as the old code.
if you want to take my code is ok .

[jterrace]

I like the enhancements, but why did you move everything out of init and main ?

[koteth]

hi, init.py in python is mainly a marker that qualifies a directory as a package.
it's usually empty so it's the last place where I search for a block of code in a project. For this reason I prefer not to use it if is not needed.

Regarding main.py file, it is usually present if you want to run a program with 'python ', but the README file suggests to install the module. So, once it is correctly installed (in setup.py i've pointed to "pyssim = ssim.ssim:main'"), the main file is not needed anymore.

[jterrace]

init being empty is a commonly used convention, but you typically import anything you want to be globally accessible from your module into it. I can't merge this because you broke compatibility with anyone using the module like this:

import ssim
ssim.compute_ssim(...)

The main file allows you to do this:

python -m ssim

or from developemt:

python ssim

[koteth]

you are right, I have made some small backward compatibility enhancements in order to support the 3 scenarios you have explained.
Now it should be ok.

[jterrace]

Pelase copy the original docstring back into this function

[koteth]

done

[jterrace]

Thanks for your contribution!

[jterrace]

Hey, would you mind sending me a PR to add yourself to the AUTHORS file?