Merge pull request #170 from Ouranosinc/update-notebooks-to-match-new-jupyter-env

Update notebooks to match new Jupyter env.

To match new Jupyter env in PR Ouranosinc/PAVICS-e2e-workflow-tests#43.

New owslib 0.19.2 (we had 0.19.1 before) dropped the remaining of python 2 support so responses are now bytes instead of string.  See PR geopython/OWSLib#659 or commit geopython/OWSLib@79f9430.  I wouldn't expect a patch version release to drop python 2 support !

New xarray 0.15.1 default to html style output that allows collapsing/expanding data, see PR pydata/xarray#3812 or commit pydata/xarray@b155853.

![2020-04-28-134427_536x549_scrot](https://user-images.githubusercontent.com/11966697/80519794-89c80000-8956-11ea-8f0d-b95360b2d46c.png)
    
Unfortunately had to force the old text style since the html style has randomness that breaks automated testing of the notebooks using nbval pytest plugin.

Finally a passing Jenkins run: http://jenkins.ouranos.ca/job/PAVICS-e2e-workflow-tests/job/new-docker-release-for-xclim/5/console

Author: tlvu