Cannot disable today's date

Hi,

I have two problems : 

1) 

I am not able to disable today's date in the datepicker:

```
$scope.disabledDates = [
     new Date()
];
```

Today's date can still be picked.

2) Because I do not want users to be able to select today's date, is there a way to remove the "today" button with a directive ?

Thank you for your help !
