Wraps and positions tabs created from child elements. Placed at the top of a card to allow users to change the state/view of the card.

Create tabs by passing in child elements to a `TabGroup`.
For each child use the `isActive` flag to control the conditions
when active styling should be applied.

#### Usage:

For instance where the URL should not change in the case of a filter,
you can use `isActive` and an `onClick` to change the content of the page.

```
<TabGroup>
  <FilterLink
    isActive={alertsListFilter === 'ALL_ALERTS'}
    onClick={this.setAlertsFilter('ALL_ALERTS')}>
    All Alerts
  </FilterLink>

  <FilterLink
    isActive={alertsListFilter === 'BUSINESS'}
    onClick={this.setAlertsFilter('BUSINESS')}>
    Business
  </FilterLink>
<TabGroup>
```