onSet returning a Number on Mouse selection, an Object on select via Keyboard (pressing enter)

Hello,

One of my clients discovered that the date wasn't saved correctly when he was tabbing through a form and selecting the value of the datepicker via the keyboard and pressing enter.

Upon debugging the issue, I noticed that indeed the datepicker supplies different values, depending on whether the keyboard or the mouse was used to trigger the selection:

Code in onSet - callback:

```
onSet: function(context) {
console.log(context, typeof context.select);
}
```

Selecting a date with the mouse returns this:

```
Object {select: 1416355200000} "number"
```

Selecting a date via keyboard returns this:

```
Object {select: Object} "object"
```

The object looks nice, and I can definitely use it, but I just wanted to let you know that it's an issue people who would use onSet: without testing keyboard interaction could stumble about:


Anyways, the datepicker itself is awesome, and very well supported, very professional, I can't thank you enough.

Best wishes

Daniel