webgl globe no longer working in meetup streaming notebook for docker_deploy

[chuckpr]

After cloning and running,

docker-compose build
docker-compose up

..running the WebGL globe cell in the meetup-streaming.ipynb gives the following error (and the globe cell output is empty):

notebook_1        | [I 18:58:58.565 NotebookApp] Installing 'PolymerElements/paper-card'
notebook_1        | bower                        ECONFLICT Unable to find suitable version for polymer
notebook_1        | [E 18:59:00.571 NotebookApp] Failed installing 'PolymerElements/paper-card' into '/opt/conda/share/jupyter/nbextensions/declarativewidgets' with cmd:
notebook_1        | ['bower', 'install', 'PolymerElements/paper-card', '--allow-root', '--config.interactive=false', '--production', '--quiet']
notebook_1        | due to: Command '['bower', 'install', 'PolymerElements/paper-card', '--allow-root', '--config.interactive=false', '--production', '--quiet']' returned non-zero exit status 1

The other widgets are working.