Remaining Effort curve on Burndown chart - v3

Considered scenario where there are no results for the given date
- sprint started on 11/19/2013
- current date is 11-20-2013
- test cases where added to test runs on current date (no test cases on
11/19/2013)

Added comments on Burndown chart algorithm.

Removed unnecessary IterationID from Iteratios/Create view.