Rio-cogeo

* add safeguard to keep datatype from input to output files (85)

**CLI Changes:**
* add `-t, --dtype` datatype option.

**API Changes:**
* add datatype option
* update for rasterio>=1.0.28
* allow rasterio.io.DatasetReader input (89)

Note: This release was deleted in PyPi.

* check internal blocksize and adapt if raster is too small (80)

* add `--web-optimized` option to create a web optimized COG (10)
* add `--latitude-adjustment/--global-maxzoom` option to adjust MAX_ZOOM for global datasets
* Web-optimized tests needs python3.6 (cogdumper)
* add `--resampling` option to select the resampling algorithm when using `--web-optimized`
* add `--in-memory/--no-in-memory` options to use temporyNamedd file instead of in-memory temp file.

**Breaking Changes:**

* remove deprecated YCBCR profile
* 512x512 dataset without internal tiling are valid

**Breaking Changes:**

* Switch from JPEG to DEFLATE as default profile in CLI (66)

**Breaking Changes:**

* refactor utils.get_maximum_overview_level to get rasterio dataset
as input and reduce the number of dataset opennings (61)