Fixes text-anchor wrongly treated as an attribute.

d3.svg.axis() `text-anchor` is set with the style attribute. In order to change the ticks `text-anchor` when labels are rotated. you need to use `style` instead of `attr`.

**Before**

![Screen Shot 2013-04-19 at 6 40 46 PM](https://f.cloud.github.com/assets/1412077/403025/69bed46a-a910-11e2-8db5-46a91b8db2a6.png)


** After **

```
![Screen Shot 2013-04-19 at 6 43 02 PM](https://f.cloud.github.com/assets/1412077/403027/7210a328-a910-11e2-8a1d-3985d2ee84f1.png)
```