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QA is happening as part of code review.

Indicator definitions: https://docs.google.com/a/dimagi.com/spreadsheets/d/1Ug09IcbogB9JyCIGS2vHV0kRTn2U_zO-Y9HRAinOpT0/edit#gid=1495052602

@emord @czue @esoergel 
this will faIl if `interval` wasn't one of the four things you anticipated. probably better to have an `assert` on interval to make that more obvious if it happens - can either do it up front or add the following clause
```python
else:
     raise ValueError("unexpected interval passed to daterange {}".format(interval))
```