Remember to list any API changes below in `doc/source/api_changes.txt`.

Version 0.12
------------
* Change `label` to mark background as 0, not -1, which is consistent with
  SciPy's labelling.
* Remove `skimage.morphology.label` from `skimage.morphology.__init__`--it now
  lives in `skimage.measure.label`.
* Remove deprecated `reverse_map` parameter of `skimage.transform.warp`
* Change depecrated `enforce_connectivity=False` on skimage.segmentation.slic
  and set it to True as default
* Remove deprecated `skimage.measure.fit.BaseModel._params` attribute
* Remove deprecated `skimage.measure.fit.BaseModel._params`,
  `skimage.transform.ProjectiveTransform._matrix`,
  `skimage.transform.PolynomialTransform._params`,
  `skimage.transform.PiecewiseAffineTransform.affines_*` attributes
* Remove deprecated functions `skimage.filter.denoise_*`