projecttacoma/bonnie — pull request #110 by jtferns (2014-02-24 17:30:37+00:00)
Title: Update coverage to compute for passing patients only

#### Story ####
- https://www.pivotaltracker.com/story/show/65923094

#### Notes ####
- update coverage model to utilize difference models instead of result models to allow for status-based rationale coverage computation