Cleaned up import statements
Fixed broken references to test datasets caused by moving the _get_test_vector/raster() functions from acronym.__init__ to acronym.tests.__init__
Slight formatting modification to commandline output
Reorganized properties and refactored unittests to use GDAL directly.  Properties are now listed in a more logical and easy to ready order.  Unittests now use the GDAL library directly, which allows any test dataset while addressing slight differences between the pygdal output and the OSGEO output.