message: Changed minimal required version of bleach Python package from 1.5 to 2.0. bleach 1.5 causes problems with Jupyter as reported in
diff: @@ -43,8 +43,8 @@ pip2 install --upgrade werkzeug==0.11.10
  pip3 install --upgrade werkzeug==0.11.10
  # Install bleach. html5lib will be picked up as a dependency.
  -pip2 install --upgrade bleach==1.5.0
  -pip3 install --upgrade bleach==1.5.0
  +pip2 install --upgrade bleach==2.0.0
  +pip3 install --upgrade bleach==2.0.0
  # Install markdown.
  pip2 install --upgrade markdown==2.6.8
  