Merge pull request #2701 from mgeier/binder-requirements

Add requirements.txt and postBuild for Binder

Author: ianhi

.binder/README

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+This directory holds configuration files for https://mybinder.org/.
+
+The interactive notebooks can be accessed with this link:
+https://mybinder.org/v2/gh/jupyter-widgets/ipywidgets/master?filepath=docs/source/examples
+
+To check out a different version, just replace "master" with the desired
+branch/tag name or commit hash.
+
+To use JupyterLab, use:
+https://mybinder.org/v2/gh/jupyter-widgets/ipywidgets/master?urlpath=lab/tree/docs/source/examples

.binder/postBuild

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+#!/bin/sh
+
+set -e
+
+npm install -g yarn
+
+./dev-install.sh

.binder/requirements.txt

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+bqplot
+ipyleaflet
+jupyterlab~=3.0
+matplotlib
+networkx
+numpy
+pandas
+scikit-image
+scikit-learn
+sympy