Stretch 1 : Extra goals

[nishayaraj]

As an authenticated user, while looking at the revenue view, I should be able to select a start and end date and view the total sum of revenue between those two dates.
As an authenticated user, while looking at the revenue view, I should be able to see a chart of revenue.
What kind of chart is up to you. As long as it's showing the amount of revenue over time.