add details to rewards

I think it's helpful to be able to see the what the items you're buying actually do in terms of stats. 
I was going to add it to a detailed view but it seems unnecessary since you can't edit them or anything.
How about like this?

![item_notes](https://cloud.githubusercontent.com/assets/6372245/3744842/1b47470e-179b-11e4-8bd0-567417352d65.png)

note: `selectTask(item)` doesn't seem to do anything so I removed it.