cleaning up re-produced outlier code; began small re-structuring of health outliers
change outlier mutate to filter %in% (teching_hospital, district_hospital)
replaced repalced -> replaced
fixing a typo (2 not 24), and the chews limit applies to both hospitals and not, according to the code on master
Merge pull request #177 from SEL-Columbia/cleanup_outliers

@myfma merged, after two changes.
@schafik Hey Salah, we need to review this stuff with you. There is a lot of commented code; we need to figure out what should be done with it.