Pygeoprocessing

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* Fixed a library wide issue relating to the underlying numpy types of
GDT_Byte Datasets. Now correctly identify the signed and unsigned versions
and removed all instances where code used to mod byte data to unsigned data
and correctly creates signed/unsigned byte datasets during resampling.
* Removed extract_band_and_nodata function since it exposes the underlying
GDAL types.
* Removed reclassify_by_dictionary since reclassify_dataset_uri provided
almost the same functionality and was widely used.
* Removed the class OrderedDict that was not used.
* Removed the function calculate_value_not_in_dataset since it loaded the
entire dataset into memory and was not useful.

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* Fixed an issue on reclassifying signed byte rasters that had negative nodata
values but the internal type stored for vectorize datasets was unsigned.

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* Package logger objects are now identified by python hierarchical package
paths (e.g. pygeoprocessing.routing)
* Fixed an issue where rasters that had undefined nodata values caused
striping in the reclassify_dataset_uri function.

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* Fixing LICENSE.TXT to .txt issue that keeps reoccurring.

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* Fixed an issue where int32 dems with INT_MIN as the nodata value were being
treated as real DEM values because of an internal cast to a float for the
nodata type, but a cast to double for the DEM values.
* Fixed an issue where flat regions, such as reservoirs, that could only drain
off the edge of the DEM now correctly drain as opposed to having undefined
flow directions.

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* Fixed a memory issue for DEMs on the order of 25k X 25k, still may have
issues with larger DEMs.