Version 0.10
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* Remove deprecated functions in `skimage.filter.rank.*`
* Remove deprecated parameter `epsilon` of `skimage.viewer.LineProfile`
* Remove backwards-compatability of `skimage.measure.regionprops`
* Remove {`ratio`, `sigma`} deprecation warnings of `skimage.segmentation.slic`
  and also remove explicit `sigma` parameter from doc-string example
* Change default mode of random_walker segmentation to 'cg_mg' > 'cg' > 'bf',
  depending on which optional dependencies are available.
* Remove deprecated `out` parameter of `skimage.morphology.binary_*`
* Remove deprecated parameter `depth` in `skimage.segmentation.random_walker`
* Remove deprecated logger function in `skimage/__init__.py`
* Remove deprecated function `filter.median_filter`
* Remove deprecated `skimage.color.is_gray` and `skimage.color.is_rgb`
  functions
* Enable doctests of experimental `skimage.feature.brief`