Pull ACS data for a specified geography from base tables B17001, B17004, B18101, B19001, B19013, B19055, B19057. Not yet implemented: B17002 Additional fields, mainly percentages and aggregations, are calculated.
pull_pov_inc(endyear, span, geography)A list containing the endyear, span, a data.frame of estimates,
a data.frame of standard errors, a character vector of the original column names,
and a data.frame of the geography metadata from acs.fetch.
An integer, indicating the latest year of the data in the survey.
An integer in c(1,3,5) indicating the span of the desired data.
a valid geo.set object specifying the census geography or 
geographies to be fetched.
acs.fetch, geo.make