Add census2000_boston.json

Converted from census2000_boston.csv using
http://www.convertcsv.com/csv-to-json.htm
Merge branch 'gh-pages' of https://github.com/codeforboston/ungentry into gh-pages
Convert allcensusacsdata to nested JSON
Delete census2000_boston.json
It was a bit hasty.
Move allcensusacsdata.json into the geodata folder
Merge pull request #12 from kent37/gh-pages

allcensusacsdata.json