improves visibility on windows

Before:

![image](https://cloud.githubusercontent.com/assets/383994/3371333/fd804eae-fb9e-11e3-971e-822f426204dd.png)

After:

![image](https://cloud.githubusercontent.com/assets/383994/3371339/14baed68-fb9f-11e3-9617-242115c34f12.png)

I use mac and windows. This makes it a little easier to bear when using windows lol.
`chalk.cyan(err.reason)` => `process.exit(1)` :p