Require ipywidgets 5.1

5.0 had API compatibility problems
see ipython/ipywidgets#522

(c) Copyright IBM Corp. 2016

pyspark-notebook/Dockerfile

@@ -46,7 +46,7 @@ USER jovyan
 
 # Install Python 3 packages
 RUN conda install --quiet --yes \
-    'ipywidgets=5.0*' \
+    'ipywidgets=5.1*' \
     'pandas=0.17*' \
     'numexpr=2.5*' \
     'matplotlib=1.5*' \
@@ -60,7 +60,7 @@ RUN jupyter nbextension enable --py widgetsnbextension --sys-prefix
 # Install Python 2 packages and kernel spec
 RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
     'ipython=4.2*' \
-    'ipywidgets=5.0*' \
+    'ipywidgets=5.1*' \
     'pandas=0.17*' \
     'numexpr=2.5*' \
     'matplotlib=1.5*' \

scipy-notebook/Dockerfile

@@ -16,7 +16,7 @@ USER jovyan
 
 # Install Python 3 packages
 RUN conda install --quiet --yes \
-    'ipywidgets=5.0*' \
+    'ipywidgets=5.1*' \
     'pandas=0.17*' \
     'numexpr=2.5*' \
     'matplotlib=1.5*' \
@@ -40,7 +40,7 @@ RUN jupyter nbextension enable --py widgetsnbextension --sys-prefix
 # Install Python 2 packages
 RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
     'ipython=4.2*' \
-    'ipywidgets=5.0*' \
+    'ipywidgets=5.1*' \
     'pandas=0.17*' \
     'numexpr=2.5*' \
     'matplotlib=1.5*' \