Added the possibility of getting multiple results

[tommelo]

As mentioned in the Issue #6 I have added the possibility of getting multiple results:

var scraper = require('google-search-scraper');

var options = {
  query: 'nodejs',
  limit: 10,
  fullResult: true
};

scraper.search(options, function(err, results) {
  if(err) throw err;
  // Array of url's
  console.log(results);
})

[steventsao]

Thanks @tommelo . This prevents an issue where a crawler gets stuck when there are fewer results than the set limit. The original result callback doesn't inform the caller when there are no more urls, and makes the following implementation fragile:

let urls = [];
 scraper.search(options, (err, url) => {
      urls.push(url);
      // handleResults is never called if there are fewer results.
      if (urls.length === options.limit) {
        handleResults(name, urls);
      }
    });