reduce friction to create environment

CONTRIBUTING.md

@@ -23,6 +23,10 @@ Anything else - [search open issues](https://github.com/github/markup/issues) or
 5. Open a [Pull Request][1]
 6. Enjoy a refreshing Diet Coke and wait
 
+**dependencies**
+
+You can run `script/bootstrap.contrib` to fetch them all.
+
 ## Testing
 
 To run the tests:

script/bootstrap.contrib

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -e
+
+cd $(dirname "$0")/..
+
+bundle install --path vendor/bundle
+virtualenv vendor/python && source vendor/python/bin/activate
+pip install docutils
+
+echo ""
+echo "*** DONE ***"
+echo ""
+echo "activate python environment with 'source vendor/python/bin/activate'"
+echo "run tests with 'bundle exec rake'"