text: var fs = require('fs');
  var firebaseCollection = require('./firebaseCollection');
  
  var enventHandler = function(e) {
    // Write output to console
    console.log(JSON.stringify(e));
  };
  
  firebaseCollection
    .createObserver('https://publicdata-transit.firebaseio.com', 'sf-muni/vehicles')
    .listen(enventHandler);
  