Handle field name and structure variations by config

[kmcurry]

The same data set in different cities can have different field names and sometimes different structure. This is currently hardcoded into geo.js. Move it to config(s), handle elegantly.

Field Example:
NAME, name, Name, PARK_NAME, NBRHD_NAME

Structure Example:
f[0].geometry.coordinates
f[0].geometry.coordinates[0][0]
f[0].geometry.coordinates[0][0][0]