Adds condo level data to local database.

Addresses Github Issue: https://github.com/chriswhong/taxMap/issues/9

Parses condobblmappings.csv (Condo BBL <-> Building BBL Mappings)
Parses output.csv (Condo data)
Fetches all buildings from database that have condos in file.
Calculates aggregate sum of annualTax per condo and saves that to the building document.
Saves the building document back to the database.