Improve installation process

[aph3rson]

Any particular reason why this isn't available on PyPI/installable via pip? Given that this package doesn't have any particularly-difficult install steps, a simple setup.py script should be just fine, combined with publishing it to PyPI.

[Storyyeller]

I'm not familiar with how to publish to PyPI. Do you want to handle this?

[oittaa]

And since this repo doesn't have any tagged releases, you can't install it with Homebrew either.

[Storyyeller]

It's mostly just a matter of me not being familiar with how to package it up for convenient distribution.

[oittaa]

I copied the startup scripts under /bin and renamed enjarify.sh -> enjarify since for example programs such as diffoscope expect that it can be called with enjarify without .sh.