Clearly state the current version near the download button.

per #276

@connors whatcha think?

![screen shot 2014-02-25 at 17 06 26](https://f.cloud.github.com/assets/97697/2265503/9d7ea6d2-9e82-11e3-84c2-e87aca101a75.png)
![screen shot 2014-02-25 at 17 06 19](https://f.cloud.github.com/assets/97697/2265504/9d803966-9e82-11e3-8cae-7260ccea2b06.png)