Update cities.json

Fix inverted top / left coordinate for springfield
Merge pull request #6 from sabas/patch-1

Update cities.json
Update cities.json

Add Cagliari
Merge pull request #8 from sabas/patch-1

Update cities.json
geojson support
Merge branch 'master' of github.com:mapzen/metroextractor-cities
update geojson
rakefile fixes
bundle
cities.geojson update
cities.geojson update
cities.geojson update
test
rake
readme
rake test
ignore
test
cities.geojson update
test