Rio-cogeo

* allow non integer nodata value (51)
* fix GDAL blocksize options casting for overview calculation (50)

* Renamed "ycbcr" profile's name to "jpeg" to reflect the compression name.
"ycbcr" profile will raise a "DeprecationWarning" (44)
* "webp" profile has been added to COG profiles. Exploitation of this new
compression mode will require GDAL 2.4 (27)
* Rio-cogeo can calculate the overview level based on the internal tile size
and the dataset width/height (37)

* write tags in output file (31)
* add bilinear, cubic spline, lanczos resampling modes for overviews

* add resampling option for overviews (28)

* Remove unnecessary compression for in-memory step (reduce runtime and memory usage) (25)

* rasterio 1.0