(feat) Made error reporting give clearer output.
(feat) Made error reporting give clearer output.

It now looks like:

```
ERROR:iron::iron: Error handling:
Request {
    url: http://localhost:3000/
    method: GET
    remote_addr: Some(127.0.0.1:57179)
    body:
}
Error was: Shown Error
```

Undeterminant/iron,mneumann/iron,albperezbermejo/iron,beni55/iron,lavriv92/iron,steveklabnik/iron,ilkosta/iron,markgeek/iron,ahwatts/iron,green-panther/iron,leeric92/iron,tempbottle/iron,Jeff-xchn/iron,bvssvni/iron,mzaccari/iron,jlegendary/iron,charsyam/iron,shama/iron,armed/iron,lcqiang521/iron,reem/iron,shaunstanislaus/iron,youprofit/iron,fenhl/iron,dorfsmay/iron,iron/iron,badboy/iron,dryganets/iron,graue/iron