gistfile1.js

results = JSON.parse(bundle.response.content);

// assuming results is an array of objects, object being the full json you pasted
out = _.map(results, function(result){
  // handle properties, ignoring versions
  result.properties = _.object(_.map(result.properties, function(valueSet, key){
    return [key, valueSet.value];
  }));
  // similar code to handle examples of {key: Array()}, maybe using _.first?
  return result;
})