DOC: info about pycppad on os X
ENH: example of how to set alternative hierarchies for spatial random effects
Merge pull request #4 from aflaxman/docs

Add more install tips and an example of changing the spatial hierarchy
ENH: example of age grouping and standardizing predictions

added to export_csv example; should it be a separate example?
Merge pull request #5 from aflaxman/docs

ENH: example of age grouping and standardizing predictions
Merge pull request #1 from ihmeuw/master

keep up with master?