Set rasterio version to 0.31.0 to avoid warp error

Matt Bertrand · Matt Bertrand · commit ea4ca740e5ec · 2016-07-29T16:25:26.000-04:00
diff --git a/setup.py b/setup.py
@@ -41,7 +41,7 @@
         'shapely',
         'pymongo',
         'numpy',
-        'rasterio',
+        'rasterio==0.31.0',
         'gdal==1.10'
     ]
 )
