Stage Page updates: fixes SPARK-804 and 8...

This shows running tasks and the task status on the Stage Page and should fix [SPARK-804] (https://spark-project.atlassian.net/browse/SPARK-804) and [811] (https://spark-project.atlassian.net/browse/SPARK-811).
![screen shot 2013-07-24 at 10 51 34 am](https://f.cloud.github.com/assets/4754931/850514/88754b44-f48a-11e2-8fe9-292693325290.png)