Group does not apply position styles to its children

The Group component does not apply its left/top style attributes to its children. In the example below, the Group is passed a valid style object with left and top values. The child Text component is rendered at [0,0] instead of being translated by the groups left/right values.

``` coffeescript
Index = React.createClass

render: ->
groupStyle =
top: 100
left: 100
width: 400
height: 400

textStyle =
top: 0
left: 0
height: 20
lineHeight: 20
fontSize: 12
width: 300

I should be indented by 100 top and left



```

The text is rendered without the 100 \* 100 translation.