Remove all versions to have conda stop trying to install python 2.7

docker/jupyter-notebook/Dockerfile

@@ -69,15 +69,15 @@ RUN cd /tmp && \
     $CONDA_DIR/bin/conda install --yes conda
 
 RUN conda install --yes \
-    'notebook=4.1*' \
+    'notebook' \
     terminado \
-    'ipywidgets=4.1*' \
+    'ipywidgets' \
     'pandas' \
     'matplotlib' \
     'scipy' \
-    'seaborn=0.6*' \
+    'seaborn' \
     'scikit-learn' \
-    'statsmodels=0.6.1' \
+    'statsmodels' \
     'ipyparallel' \
     'basemap' \
     'pillow' \