Update simpleitk to 1.2.0

[pyup-bot]

This PR updates SimpleITK from 1.1.0 to 1.2.0.

Changelog

1.2rc1

Announcement

We are pleased to announce SimpleITK 1.2 Release candidate 1.

Release Notes

- Improvements
- New look for ReadTheDocs, along with more examples and documentation. (http://simpleitk.readthedocs.io/en/master/)
- Support for stream reading regions from files. The `ImageFileReader` adds the option to specify a image region to extract while reading from disk. (https://simpleitk.readthedocs.io/en/master/Examples/AdvancedImageReading/Documentation.html)
- Option to specify the ITK `ImageIO` used in the `ImageFileReader class` or `ReadImage` procedure. (https://simpleitk.readthedocs.io/en/master/Examples/ImageIOSelection/Documentation.html)
- Multi-resolution BSpline registration by adapting the `BSplineTransform` resolution in the `ImageRegistrationMethod`. (https://simpleitk.readthedocs.io/en/master/Examples/ImageRegistrationMethodBSpline3/Documentation.html)
- Added `BSplineDecompositionImageFilter` , and new `BSplineTransform` initialization from coefficient images.
- Added `ImageRegistrationMethod` method `GetMetricSamplingPercentage` to get the number of samples used after each iteration.
- Wrapping of the SLICImageFilter ( http://hdl.handle.net/10380/3596 ).
- New `ImageViewer` class to support state-full parameters while providing the behavior supported by the `Show` procedure. 
- Added support for multi-component images to `ClampImageFilter`, `MeanProjectionImageFilter`, `SumProjectionImageFilter`, and the  `TileImageFilter`.
- Improvements to the R interface and packaging.
- Fix 4D Image support in the Python `GetArrayFromImage` and `GetArrayViewFromImage` procedures.
- Added Transform `FlattenTransform` method, to combine nested composite transforms.
- ITKv5 compatibility enables SimpleITK to be compiled against ITKv5 betas.
- The default and binaries are built against the proven ITK 4.13.1 release branch. Comprehensive SimpleITK testing has lead to improvements in upstream ITK. (https://github.com/InsightSoftwareConsortium/ITK/releases/tag/v4.13.1)
- Miscellaneous build and documentation fixes.


Python Binary Downloads

- Many binary Python wheels are available for download and testing. It is important to have the latest pip version to ensure correct wheel compatibility. To install the SimpleITK package:

pip install --upgrade pip
pip install --pre -f https://github.com/SimpleITK/SimpleITK/releases/tag/v1.2rc1 SimpleITK

Links

• PyPI: https://pypi.org/project/simpleitk
• Changelog: https://pyup.io/changelogs/simpleitk/
• Homepage: http://simpleitk.org/