[scikit-image] Important change in testing environment

[Egor Panfilov]

Dear contributors,

We'd like to notify your that we have just finished a transition of our
testing environment from `nose` to `pytest` (see
https://github.com/scikit-image/scikit-image/pull/2468 for the details).

We kindly ask you to revisit your open Pull Requests on GitHub, perform a
rebase onto `master` branch of `scikit-image/scikit-image` repo (see
http://scikit-image.org/docs/dev/contribute.html#divergence-between-upstream-master-and-your-feature-branch),
and rewrite your tests using `pytest` wherever is needed.

Usage of the functions from `numpy.testing` in addition to `pytest` ones is
allowed, but, please, notice that some of them (such as `assert_raises`)
rely on `nose` under the hood, and, therefore, should not be used.

Sorry for the inconvenience.
Looking forward to seeing your contributions updated and merged.

Regards,
Egor,
scikit-image core team
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