Improve initial inapp page (bug 1059959)

- Hide table until user clicks 'Add a product'
- Add documentation link

![screenshot 2014-09-04 15 48 13](https://cloud.githubusercontent.com/assets/119884/4155642/7891572c-346c-11e4-84aa-93a5f443912b.png)
![screenshot 2014-09-04 15 48 22](https://cloud.githubusercontent.com/assets/119884/4155644/7e18a128-346c-11e4-866f-808d4f3ca5d7.png)


I think this should be at a higher level than the button itself. Might be nice to update this component to publish a new event.

```js
this.on('click', 'uiAddRow');
this.on('uiAddRow', function () {
    // Old click code.
});
// ... later
// Could make a new component for this but that seems crazy.
$('#in-app-products').on('uiAddRow', function () {
    $(this).removeClass('empty');
});
```