Proper initialization of pointers.
Proper initialization of pointers.

Closes #90.

youngpm/rasterio,perrygeo/rasterio,snorfalorpagus/rasterio,clembou/rasterio,brendan-ward/rasterio,clembou/rasterio,kapadia/rasterio,youngpm/rasterio,kapadia/rasterio,kapadia/rasterio,njwilson23/rasterio,sgillies/rasterio,johanvdw/rasterio,perrygeo/rasterio,perrygeo/rasterio,youngpm/rasterio,njwilson23/rasterio,brendan-ward/rasterio,johanvdw/rasterio,njwilson23/rasterio,johanvdw/rasterio,clembou/rasterio,brendan-ward/rasterio