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 local database.

 *These files must exist in the directory you are running condoBuilder.js in.*