Do not consider a newline to be line noise

@ggrossman @atsoy04 

Newlines should not be line noise 


One thing that still bugs me is that credit card numbers are almost always paired with an expiration date and maybe the CVV code. I can imagine somebody typing their credit card number and the expiration MM/YY immediately after:

```
1234 5123 4512 348 08/16
```

The `08/16` is going to make us not sanitize the whole number, right... At least if they type

```
1234 5123 4512 348 expires 08/16
```

we will catch that.