• Should handle change of Story Points value

https://extranet.atlassian.com/display/GHDEV/Estimation+and+Tracking+in+the+Rapid+Board#EstimationandTrackingintheRapidBoard-Tracking

• The graph begins at the start time of the Sprint, it logically ends on the specified end date of the Sprint (which is marked on the graph) but continues until the time the Sprint was actually closed
• Allow the Sprint to be specified but default to currently active Sprint
• The start value of the graph does not compensate for changes after the start of the sprint to the value
• Items burn down as they reach the done column
• Items that are added to the Sprint after its beginning are shown as scope change
• Items that are removed from the Sprint after its beginning are shown as scope change
• Items that have their estimate changed after the beginning of the Sprint are shown as scope change
• Scope changes (i.e anything other than a burndown) are shown with some sort of visual signal and information on hovering the inflection point