Add plugin dependencies to setup.py

[sbesson]

Also include classifiers and license

[sbesson]

Noticed while working on #28 and #29 and trying to re-add all the dependencies of the plugin. With the last release of ome-zarr-py (ome/ome-zarr-py#55), scikit-image is also transitively declared as a dependency.

Minimally tested with

FROM centos:7

RUN yum install -y git python3 fontconfig
RUN useradd -ms /bin/bash zarr
USER zarr

RUN python3 -m venv /tmp/venv && /tmp/venv/bin/pip install -U pip wheel && /tmp/venv/bin/pip install https://github.com/ome/zeroc-ice-py-centos7/releases/download/0.2.1/zeroc_ice-3.6.5-cp36-cp36m-linux_x86_64.whl
RUN /tmp/venv/bin/pip install git+https://github.com/sbesson/omero-cli-zarr@plugin_dependencies

ENTRYPOINT ["/tmp/venv/bin/omero", "zarr", "-h"]

[manics]

I was going to suggest something here, but ended up in a rabbit hole... pypa/packaging.python.org#95

[sbesson]

Agreed. https://packaging.python.org/guides/distributing-packages-using-setuptools/#license suggests that the classifiers should be the reference place for the project license in all cases. Happy to remove the license keyword if the vocabulary if unclear as I could not find a list of official terms either.

[manics]

https://github.com/ome/omero-py/blob/dab7f1790ec0c0b5f0db0beaf3948b328a41e469/setup.py#L179-L233 doesn't have a license field and no-one's said anything.

[sbesson]

I think the remaining pre-commit issues are now unrelated to this PR but to changes already merged on master

[joshmoore]

Travis is gone in the mainline. Merging.