Added map reduce functions to get runs/weekday

This is a sample only - need to decide were to put it and if we want to move the map_reduce logic into the model.

(This doesn't need to be pulled in here, but it's kinda cool - this could be used to do stats on ALL the runners and such).

This adds a graph to the top of the dashboard/profile that shows the number of runs per weekday:
![image](https://f.cloud.github.com/assets/160236/80947/09b3a158-62da-11e2-901b-43fc4031e8d3.png)

And yes, I stayed up WAY to late to do this.