A first pass to let the gallery build using sphinx-gallery.

doc/source/api_changes.rst

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+Version 0.13
+------------
+- `skimage.filter` has been removed. Use `skimage.filters` instead.
+- `skimage.filters.canny` has been removed.
+  `canny` is available only from `skimage.feature` now.
+
+Version 0.12
+------------
+- ``equalize_adapthist`` now takes a ``kernel_size`` keyword argument, replacing
+  the ``ntiles_*`` arguments.
+- The functions ``blob_dog``, ``blob_log`` and ``blob_doh`` now return float
+  arrays instead of integer arrays.
+- ``transform.integrate`` now takes lists of tuples instead of integers
+  to define the window over which to integrate.
+- `reverse_map` parameter in `skimage.transform.warp` has been removed.
+- `enforce_connectivity` in `skimage.segmentation.slic` defaults to ``True``.
+- `skimage.measure.fit.BaseModel._params`,
+  `skimage.transform.ProjectiveTransform._matrix`,
+  `skimage.transform.PolynomialTransform._params`,
+  `skimage.transform.PiecewiseAffineTransform.affines_*` attributes
+  have been removed.
+- `skimage.filters.denoise_*` have moved to `skimage.restoration.denoise_*`.
+- `skimage.data.lena` has been removed.
+
+Version 0.11
+------------
+- The ``skimage.filter`` subpackage has been renamed to ``skimage.filters``.
+- Some edge detectors returned values greater than 1--their results are now
+  appropriately scaled with a factor of ``sqrt(2)``.
+
+Version 0.10
+------------
+- Removed ``skimage.io.video`` functionality due to broken gstreamer bindings
+
+Version 0.9
+-----------
+- No longer wrap ``imread`` output in an ``Image`` class
+- Change default value of `sigma` parameter in ``skimage.segmentation.slic``
+  to 0
+- ``hough_circle`` now returns a stack of arrays that are the same size as the
+  input image. Set the ``full_output`` flag to True for the old behavior.
+- The following functions were deprecated over two releases:
+  `skimage.filter.denoise_tv_chambolle`,
+  `skimage.morphology.is_local_maximum`, `skimage.transform.hough`,
+  `skimage.transform.probabilistic_hough`,`skimage.transform.hough_peaks`.
+  Their functionality still exists, but under different names.
+
+Version 0.4
+-----------
+- Switch mask and radius arguments for ``median_filter``
+
+Version 0.3
+-----------
+- Remove ``as_grey``, ``dtype`` keyword from ImageCollection
+- Remove ``dtype`` from imread
+- Generalise ImageCollection to accept a load_func