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Add spline_filter and spline_filter1d (#215)

* add spline_filter and spline_filter1d to ndinterp

* call da.from_array on the input if it is not already a Dask array

* support use of prefilter kwarg for affine_transform

exclude use of boundary modes that require additional padding

* test affine_transform with additional prefilter and mode combinations

* avoid warnings about deprecated import from collections

* fix copy/paste error in _dispatch_ndinterp.py

* minor cleanup in test_affine_transformation.py

* TST: add spline_filter tests

* add order-dependent default depth

The required depth is related to the magnitude of the spline prefilter poles

* TST: test output argument of spline_filter functions

* DOC: update coverage.rst

* TST: fix test_affine_transform_prefilter_modes

input_output_shape_per_dim requires sizes larger than the depth used by spline_filter

* add scipy and dask version-dependent skip

older dask didn't automatically rechunk during map_overlap

fix veriable names:
_supported_periodic_modes -> _supported_prefilter_modes
_unsupported_periodic_modes -> _unsupported_prefilter_modes

* add one more scipy version-dependent skip

* TST: improve coverage by testing corner cases

* enable mode='grid-wrap' for spline_filter

* rename temporary variable to _depth to avoid shadowing function argument

* fix typo in test_spline_filter_array_output_unsupported

* fix: allow grid-warp in spline_filter1d as well

* pep8 fixes

* more informative mode-related error messages

* update scipy.ndimage import style

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