Fix image building via conda on mybinder about sage-binder-env HOT 5 CLOSED

Looks like it might be an issue in conda? Either the path to the conda environment contains non-ASCII characters, or somehow the paths in one of the package tarballs contains non-ASCII characters, and it's running into an implicit ASCII decoding caused by trying to concatenate a unicode string with a non-unicode string.

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Saw this issue by accident. You should post this on https://github.com/conda-forge/sage-feedstock/issues
This was a problem with the rw package which installed a file share/doc/rw/Hängematte. I've fixed this here, conda-forge/rw-feedstock#2
Note that this error appeared only on anaconda2 and not on anaconda3.

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@isuruf: you are everywhere :-)
Thanks so much for spotting and fixing it!

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Although working out the problem with conda would be worthwhile, now that binder supports Docker images it might be a moot point. Starting from the pre-built Sage image might be faster and simpler even than using Conda for this purpose.

I'm making progress on a few small enhancements to the official sagemath image that will make deploying it on binder easier too.

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Yes. We now use pre-built Sage image. It works well.

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