(feat) Implemented single-line logging format with colored response codes.

This change makes the logger print a single line by default, that looks like:
```
GET /favicon.ico -> 200 OK (0.000367 ms)
```
The method is printed in bold, and the response code is colored blue for 100s, green for 200s, yellow for 300s, and red for 400s and 500s.

![screen shot 2014-06-17 at 5 20 35 pm](https://cloud.githubusercontent.com/assets/5461443/3308416/6f5199a0-f67e-11e3-84b8-6c36ca52686d.png)