Adding --noColor argument.

Fixes #40: How to dismiss the color 
I'm a bit confused, this is what I see on my terminal:
![screen shot 2014-09-08 at 12 19 28](https://cloud.githubusercontent.com/assets/419703/4187644/932252e2-376b-11e4-932c-019ce1464b91.png)

I can change it to `full: no-color`, I just want to make sure I'm consistent with `ignoreCase` and `fileColor` shall I change those two too?

Thanks!