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Trust in GDAL's reference counting (rasterio#1800)

* Trust in GDAL's reference counting

Towards resolving rasterio#1799

* Require GDAL 2

* Revert to local dataset handle

* Run tests under gdb

* Implement GDALDatasetH reference counting in stop()

This keeps datasets used in a WarpedVRT from crashing GDAL and
Python when they are closed before the VRT.

* Bump version

* Remove gdb

Adding missing _transform.c to setup script

rasterio 1.1 built from an sdist won't import without this.

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Restore int coercion to block size guard

Resolves rasterio#1769

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Bump version to 1.0.26

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Update version and change log

Update version and change log