Displaying Enrollment Mode on Enrollment Activity Page

![screen shot 2014-10-24 at 3 57 08 pm](https://cloud.githubusercontent.com/assets/910510/4775506/9e6ec7ea-5bb8-11e4-8ac1-9d6ed311a8a8.png)

@rocha @dsjen @marcotuts @shnayder @lamagnifica 
I find it confusing that as a side effect of having a `graphSelector` that the graph is then shifted down.  Maybe it's just a naming thing.  Can it be renamed to something like `graphSelectorForShift` or `translateSelector` with a little note about what the purpose is?