Added back the removal of temporary file in parser. Added fix for Windows/GDAL file locking issue

Author: carderm

raster/tiles/parser.py

@@ -412,7 +412,8 @@ def process_quadrant(self, indexrange, zoom):
             RasterTile.objects.bulk_create(batch)
 
         # Remove quadrant raster tempfile.
-        # os.remove(dest_file_name)
+        snapped_dataset = None
+        os.remove(dest_file_name)
 
     def push_histogram(self, data):
         """