Pygeoprocessing

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* Fixed a bug on the test that determines if a raster should be memory
blocked. Rasters were not getting square blocked if the memory block was
row aligned. Now creates 256x256 blocks on rasters larger than 256x256.
* Updates to reclassify_dataset_uri to use numpy.digitize rather than Python
loops across the number of keys.
* More informative error messages raised on incorrect bounding box mode.
* Updated docstring on get_lookup_from_table to indicate the headers are case
insensitive.
* Added updates to align dataset list that report which dataset is being
aligned. This is helpful for logging feedback when many datasets are passed
in that don't take long enough to get a report from the underlying reproject
dataset function.
* pygeoprocessing.routing.routing_core includes pxd to be ``cimport``\able
from a Cython module.

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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.