Demo Rmd, R and py notebooks in binder

[mwouts]

Add Rmd, R and py versions of a notebook with code, results and images, plus its ipynb rendering, so that people can open and test them in binder #19 .

Document a few manipulations:

• edit text notebook (do we have a text editor in binder?) and reload (inputs are updated)
• delete .ipynb notebook and reopen source notebook (inputs disappear)

[betatim]

To directly open a file via a link try https://mybinder.org/v2/gh/binder-examples/requirements/master?urlpath=/edit/requirements.txt this will open requirements.txt in a basic editor that is part of jupyter notebook. Take a look at the URI for this once it has opened, you should be able to deduce the general pattern for constructing links to files opened in an editor

I think jupyter lab has a slightly better editor, but not sure how to construct the URI off the top of my head.

[mwouts]

Great! That's exactly what I wanted. Thanks @betatim

[RaoOfPhysics]

To use Jupyterlab's editer, use this:

https://mybinder.org/v2/gh/binder-examples/requirements/master?urlpath=lab/tree/requirements.txt

Per the instructions here –– https://github.com/binder-examples/jupyterlab –– you need to change the urlpath from /edit/foobar.txt to /lab/tree/foobar.txt.