move view older btn into container

Group the button into the container with the rest of its stuff. Got confused why there were "View older" buttons floating in space between threads.

Before
---------

![screen shot 2013-10-09 at 11 47 25 am](https://f.cloud.github.com/assets/674727/1300526/4a081498-3113-11e3-8353-73a3a754c82e.png)

After
------

![screen shot 2013-10-09 at 11 47 11 am](https://f.cloud.github.com/assets/674727/1300527/4afcd23a-3113-11e3-926c-f4de1c4c2536.png)