setup the environment correctly

Author: kmader

binder/postBuild

@@ -1,6 +1,7 @@
 curl -L "https://www.dropbox.com/s/dlmpr7wabehq3x0/models.zip?dl=1" > models.zip
 unzip models.zip
 rm models.zip
+source activate kernel # ensure we are in the py27 environment
 pip install appmode
 jupyter nbextension enable --py --sys-prefix widgetsnbextension
 jupyter nbextension     enable --py --sys-prefix appmode