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Prevent rare segfault

Python 3.6

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Crs env (rasterio#1544)

* Refactor to make data search testable

* Test ensure_env with faked sys.prefix and _env file location

* raising=False

* Don't call fixture function, use it as a fixture

* Re-applying PR rasterio#1546 to maint-1.0 via patch (rasterio#1549)

* Refactor to make data search testable

* Test ensure_env with faked sys.prefix and _env file location

* raising=False

* Don't call fixture function, use it as a fixture

* Add function to get context if needed

* added support for ESRI wkt strings - resolves issue rasterio#1537 (rasterio#1538)

* updated _handle_crswkt to use CRS.from_wkt; resolved issue rasterio#1540 (rasterio#1541)

* updated _handle_crswkt to use CRS.from_wkt; resolved issue rasterio#1540

* added test for datasetreader opening dataset with ESRI projection wkt string

* Handle GDAL's comments about WKT to PROJ conversion

* Bring Env inside methods if needed

* New test of compound CRS that was crashing 1.0.9

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