Sort list of requests per domain by no of requests in descending order

```
./phantomas.js --url=http://www.cnn.com --modules=domains --verbose

Requests per domain:
 www.cnn.com: 1 request(s)
 edition.cnn.com: 5 request(s)
 z.cdn.turner.com: 4 request(s)
 cdn.optimizely.com: 1 request(s)
 cdn.krxd.net: 1 request(s)
 www.ugdturner.com: 1 request(s)
 cdn3.optimizely.com: 1 request(s)
 i.cdn.turner.com: 51 request(s)
 i2.cdn.turner.com: 49 request(s)
 128727546.log.optimizely.com: 2 request(s)
 www.facebook.com: 4 request(s)
 ads.cnn.com: 15 request(s)
 static.ak.fbcdn.net: 5 request(s)
 external.ak.fbcdn.net: 10 request(s)
 static.chartbeat.com: 1 request(s)
 platform.twitter.com: 2 request(s)
 secure-us.imrworldwide.com: 2 request(s)
 twitter.com: 1 request(s)
 ping.chartbeat.net: 2 request(s)
 p.twitter.com: 1 request(s)
 connect.facebook.net: 1 request(s)
 apiservices.krxd.net: 1 request(s)
 static.ak.facebook.com: 3 request(s)
 svcs.cnn.com: 2 request(s)
 s-static.ak.facebook.com: 1 request(s)
 beacon.krxd.net: 1 request(s)
```