Earthpy

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- Changed variable name for ``angle_altitude`` to ``altitude`` in
``hillshade()`` (nkorinek, 436)
- Added alpha arguments to ``hist()`` and ``plot_bands()`` (nkorinek,
409, 410)
- Add vignette to download data from URLs and EarthPy using
``data.get_data()`` function (jlpalomino, 396)

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- Added alpha arguments to ``hist()`` and ``plot_bands()`` (nkorinek,
409, 410)

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- Update ``hist()`` function to support masked arrays and single-dim
arrays (nkorinek, lwasser 390)
- Add vignette for using the ``clip_shp()`` function (nkorinek, 378)

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- Fix to the colorado-flood dataset which had nested folders (lwasser,
387)

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- Updated colorado-flood dataset to fix file name (lwasser, no
associated issue)
- Add vignette for using the hist() function (nkorinek, 331)
- Added file explaining all of the dataset available through EarthPy
(nkorinek, 369)
- Added ``es.crop_image()`` example to the stack/crop vignette
(nkorinek, 368)

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- Added twitter flood dataset to ``io.py`` (nkorinek, 367)
- Add example vignette for using the hillshade function (nkorinek,
329)
- Modified ``es.spatial()`` to include a function called ``crop_all()``
that crops a list of images (nkorinek, 333)
- Updated stack to ensure inputs are of same rows/cols/bands, CRS, and
Affine transform (joemcglinchy, 334)
- Add vignette for using the plot_bands() function (nkorinek, 315)
- Add example vignette for stacking and cropping raster bands with
EarthPy (nkorinek, 267)
- Add example vignette for plotting band combinations with EarthPy
(jlpalomino, 306)