do everything that verify used to do, but now with headers
s/verify/compile
add more stats
add abort exits
update us census places
add % to fields
more data quality checks
rename id field
remove obsolete us mapping files
a small fix to README
sameAs
add more validation
rename @id to id
recurse subdirectories
guarantee a consistent field order across runs
census_places use validThrough
remove validFrom for now
Merge pull request #47 from opencivicdata/compile

merge compile branch