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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 
Just checked with:
`list(intervals('month', datetime.date(2014, 1, 1), datetime.date(2014, 12, 30)))`

Returned a list of tuples of `(datetime.date(2014, 1, 1), datetime.date(2014, 1, 31))` to `(datetime.date(2014, 12, 1), datetime.date(2014, 12, 30))`

Looks correct to me.