Rasterio

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- Google cloud storage support was *not* in fact added in 1.0.14, but is
present in 1.0.15.

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- The _CRS class has been refactored so that a WKT representation, rather than
PROJ4 representation, is the canonical form. This resolves issues 1397 and
1587 specifically, and an entire category of issues discussed in
https://rasterio.groups.io/g/dev/message/68.
- Native support for Google Cloud Storage using "gs://" URLs has been added
(1577).
- On entering a dataset context (DatasetBase.__enter__) a new anonymous GDAL
environment is created if needed and is entered. This makes `with
rasterio.open(...) as dataset:` roughly equivalent to `with
rasterio.open(...) as dataset, Env():`. This helps prevent bugs when datasets
are created and then used later or are used in different scopes.

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- Fix a buffer dttype mismatch on Windows introduced in 1.0.12 (1579).

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- Rasterio's lower level I/O functions now take Py_ssize_t index arrays and
will raise exceptions for type mismatches instead of swallowing the
exceptions (1076).
- The _boundless_vrt_doc function's background layer no longer needs an
in-memory dataset and the performance regression noted in 1499 has been
reversed. We've also found a performance improvement in masked boundless
reads in the case that the source data is entirely valid.
- The signature of the private _boundless_vrt_doc function in rasterio.vrt has
changed. Its background keyword argument now takes an int or float, a new
masked keyword argument has been added, and the function returns a unicode
str instead of ascii-encoded bytes.
- The copy and copyfiles functions of rasterio.shutil now raise an exception
when the source and destination paths identify the same dataset (1569).

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- Prevent needless warning when making boundless reads with a fill value
(1499).
- The GDAL band cache is flushed at the top of build_overviews to fix 1497.
- Options --gdal-data and --proj-data have been added to the rio-env command so
that users of Rasterio wheels can get paths to set GDAL_DATA and PROJ_LIB
environment variables.
- The attempt to make GDAL and PROJ support file discovery and configuration
automatic within methods of the CRS class has been reverted. Users must
execute such code inside a `with Env()` block or set the GDAL_DATA and
PROJ_LIB environment variables needed by GDAL.

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- Avoid segmentation fault when OSRGetAuthority* functions return null
pointers, making Rasterio more robust when reading CRS that don't map
perfectly to PROJ.
- Ensure that GDAL and PROJ support files can be found in Rasterio wheels when
we call CRS methods (1539).
- Accomodate the Esri flavor of projection WKT (1537).
- Add missing raster offsets and scales properties (1527).