Sep-mw4

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* Fix bug when using masked filter and noise array where objects with member
pixels at end of image (maximum y coordinate) were erroneously missed.

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* Remove features deprecated in previous versions.

* Fix bug in Background.rms() giving nonsensical results.

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* New, more coherent C API. This change should be transparent to users
of the Python module.

* Add variance uncertainty parameters `errx2`, `erry2` and `errxy` to
output of `sep.extract()`.

* Add a minimum sigma to `sep.winpos()` to match Source Extractor
behavior.

* Fix use of boolean masks in `sep.kron_radius()`. Formerly, using a
boolean mask resulted in nonsense results.

* Fix segfault in `Background.back()` when box size is same as image size.

* Fix bug in creating long error messages on Python 3.

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Adds OS X and Windows support.

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Bugfix release for problem in setup.py in packaged code.

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* `sep.extract()` now uses a more correct matched filter algorithm in the
presence of a noise array, rather than simple convolution. The `conv`
keyword has been changed to `filter_kernel` to reflect this, and a
`filter_type` keyword has been added to allow selecting the old behavior
of simple convolution.

* `sep.extract()` now accepts a `mask` keyword argument.

* `sep.extract()` can now return a segmentation map.

* Special methods added to allow `data - bkg` and `np.array(bkg)` where
`bkg` is a Background object.