Adjust data endpoints to allow multiple counties
Change batch endpoint into a GET endpoint
Remove much unused code. Fix up tests. Combine subquery filter code
Merge upstream. Fix typos and js lint warnings
conveersions -> utils
Triplet -> Pair
Doc update
Merge pull request #108 from danny8000/msa_search_within_map

Msa search within map
Merge pull request #109 from cmc333333/data-multiselect

Nice change to allow multiple county selection.  Thanks for fixing my JS typos.