Prettified output

 - The host now appears in magenta. 

 - When starting a task, it prints the task id without color.
   The line will turn red on failure and green on success, presenting a X or check

See: https://www.dropbox.com/s/i64aupf4xd92x4p/Screenshot%202014-05-07%2011.24.24.png
![screenshot 2014-05-07 11 24 24](https://cloud.githubusercontent.com/assets/1464035/2904470/f55beb52-d5fb-11e3-9c61-4cbb08460390.png)