Changed ordering of tasks in the task list to be most recently submitted...

... first (within each grouped list of tasks)

![order_by_time_submitted](https://f.cloud.github.com/assets/2633943/746761/a6019964-e437-11e2-97ec-74844f54d73a.png)


Not entirely sure what the original sort was for on line 58. Hope no-one is going to miss that.