Add recently updated pages and recently indexed items to the dashboard, ...

...and move the dashboard to a resource route
![screen shot 2014-02-19 at 16 01 04](https://f.cloud.github.com/assets/111218/2213603/b097e162-99c2-11e3-96bc-91406dedbe59.png)

I'm reusing the `catalog#admin` partials, so when they get edit/remove/public views, the dashboard will get them for free.