Extract Cedar-14 package name/version pairs from https://devcenter.heroku.com/articles/cedar-ubuntu-packages

extract-cedar-14-packages.js

_.chain($('tbody tr'))
  .map(function (row) {
    return [
      $(row).find('td:nth-child(1)').text().trim(),
      $(row).find('td:nth-child(3)').text().trim()      
    ];
  })
  .reject(function (pair) {
    return pair[1] === 'absent';
  })
  .map(function (pair) {
    return pair.join('=');
  })
  .join(' ')
  .value();