Release v0.10.0.

Merge pull request jupyterlab#67 from ian-r-rose/0.34

Updates for JupyterLab 0.34

Merge pull request jupyterlab#60 from ian-r-rose/jlab0.33

Updates for 0.33

Merge pull request jupyterlab#44 from ian-r-rose/jlab0.32

Updates for JupyterLab v0.32

Merge pull request jupyterlab#31 from ian-r-rose/jlab_0.31

Updates for JupyterLab 0.31rc2