Add ajax beacon to dashboard.

Onload:

![Screen Shot 2013-01-02 at 5 47 59 PM](https://f.cloud.github.com/assets/744212/39511/d69b936a-552e-11e2-8316-743f15efd287.png)

On Ajax:

![Screen Shot 2013-01-02 at 5 49 47 PM](https://f.cloud.github.com/assets/744212/39512/e3b66660-552e-11e2-91ab-bb21607508d1.png)