* Bump `base-notebook`
	* OS version
	* `jupyterlab`
* Bump `scipy-notebook`
	* `beautifulsoup4`
	* `cloudpickle`
	* `dask`
	* `numba`
	* `xlrd`: version specified (it was not the case)
* Bump `datascience-notebook`
	* `r-devtools`
	* `r-forecast`
	* Julia version
	* Test added to check if Julia is correctly installed (`julia --version`)
	* Note: A new version of `r-base` is out `4.0.0` however it cannot be installed yet since dependencies with other packages cannot be resolved.
* Bump `r-notebook`
	* Same as `datascience-notebook` except Julia.
* Bump `all-spark-notebook`
	* `r-sparklyr`

ihaskell-notebook binder urlpath

Change the Community Stacks ihaskell-notebook Binder urlpath to the revived IHaskell.ipynb notebook.

add pytables and bottleneck

[DOC] Selecting image doc minor fixes

* Fix a sentence saying that `pandoc` is not installed on `base-notebook` #1013
* Precision on emacs installation (`emacs-nox`) #1059

Added basic tests on some important components

add vim to minimal-notebook (cf. issue 779)

[DOC] #1060 Fix conda command to create env

Housekeeping

* tensorflow basic tests following #1002
* pandas basic tests following #1063

`conda env create` is only to create environment from a `YAML` file.  Fixed the command in "Add a Python 3.x environment".

[Reference](https://conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html)

and also make the code more readable.

- Bump root container version
- Bump  packages of
  - scipy-notebook
  - r-notebook
  - datascience-notebook
- add -y flag to jupyter lab commands in scipy-notebook
- Fix a bug in check outdated packages when packages installed through pip

Tring to swithch to the last bionic Travis build environment.
https://docs.travis-ci.com/user/reference/bionic/

Bump miniconda -> 4.8.2

recipe: dask