Allow spacy.en.download to take a file path

[ExplodingCabbage]

As noted at #208 (comment), it's possible to install spaCy models to a custom path via sputnik.install, but looking at the code for en/download.py it seems that there's no way to specify a custom path when installing via python -m spacy.en.download.

It would be nice to have this feature, especially since download.py offers niceties like checking whether the model is already installed that sputnik.install doesn't do.

A syntax like python -m spacy.en.download --download-path=/path/to/download/model/to seems like it'd be ideal.

[honnibal]

Sounds great. Do you want to make the pull request?

[ExplodingCabbage]

Sure - I'll try to get round to it today, otherwise I'll put something together over the weekend.

[honnibal]

Btw, I've been trying to improve options for file loading more generally. There's some stuff in spacy.utils that isn't in the docs yet but might be relevant. Specifically, you should be able to set the default data path.

[lock]

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