chown: add logging and a test

Signed-off-by: Brett Randall <javabrett@gmail.com>

Signed-off-by: Brett Randall <javabrett@gmail.com>

Signed-off-by: Brett Randall <javabrett@gmail.com>

[ci skip] stderr when no tty

[ci skip] Fix spark version check

Not in PATH

[ci skip] Improve manifests, update index page

[ci skip] Add package manifest support

Generates manifest pages and pushes them
to the docker-stacks GitHub wiki.
Does not update a global index of all builds yet.

Enable color terminal in common cases

devtools install_github does not work

Added clarification on the use of NB_UMASK, which only applies to the…

Balance closing quote in doc for CHOWN_EXTRA example.

Update packages in scipy-notebook

Getting ahead of myself here ...

notebook 5.7.5

Made variable reference PYTHONPATH safe in case of set -eu.

and conda to 4.6.7

Require Dask 1.1 in the scipy-notebook

Signed-off-by: Brett Randall <javabrett@gmail.com>

Fix for build error #807

Fix permissions in parent dir of $CONDA_DIR instead of $CONDA_DIR

Julia 1.0.0 => 1.1.0

This is the latest stable release of Julia.

I also cleaned up the package operations and added `QuantEcon/InstantiateFromURL.jl`, which is a small utility for binding Julia dependency information to a Jupyter notebook.

Builds fine on my local machine.