Update README.md as suggested in #802

Add intermediate example to describe port mapping

Add reference to education-notebook

Co-Authored-By: damianavila <damianavila82@yahoo.com.ar>

Support for ODBC

scipy-notebook: update ipywidgets

I recommend to add the support for ODBC.

Fix logging bug in run-hooks (order of logging statement)

- The "done running loop" log message was inside the loop, causing it
  to appear over and over again, making log quite confusing.

Updated R packages in datascience-notebook to match r-notebook packages update in PR #786

[ci skip] ARG does not survive past FROM

Hardcode the tag in two places

Add an example binder

Fix bug where container user is "nayvoj"

Addresses code review by @GrahamDumpleton

Updated R packages in r-notebook to match all-spark-notebook update in PR #782

whoami &> /dev/null || STATUS=$? && true
causes STATUS to be set to an empty string
when the container starts with option --add-group="root"
resulting in both nayvoj and jovyan having uid=1000
and gid=100. The first match in /etc/password wins
and so the container user ends up being "nayvoj"
accidentally.

Avoid this by checking that whoami STATUS is neither blank nor 0
before adding a new /etc/passwd entry

fixing inline script problem

Replace vim by nano in the minimal-notebook documentation (fix #779)

Update all R libs in all-spark-notebook for Spark 2.4 

umask flag

Add note about customizing the startup with before-notebook.d