attempt to fix import error

Author: chriddyp

Diff for: plotly/__init__.py

@@ -28,5 +28,5 @@
 
 from __future__ import absolute_import
 
-from plotly import plotly, graph_objs, tools, utils
+from plotly import plotly, graph_objs, grid_objs, tools, utils
 from plotly.version import __version__