Allow geocoding in debug

Geocoding is an expensive process, and sometimes we want to be able to
run local ETL scripts that generate geo data but don't actually run
against a geocoder.  The `debug` flag enables this functionality.

This is intended to only be used for local testing, and the flag may
disappear in future.

Issue #139

etl/etl/competition.py

@@ -1306,6 +1306,7 @@ def __init__(
         new_column_name,
         address_pattern,
         geocoder,
+        debug=False,
     ):
         """Takes:
         1. The name of the new column.
@@ -1315,6 +1316,7 @@ def __init__(
         self.new_column_name = new_column_name
         self.address_pattern = address_pattern
         self.geocoder = geocoder
+        self.debug = debug
 
     def column_names(self):
         return [self.new_column_name]
@@ -1325,6 +1327,9 @@ def cell(self, proposal, column_name):
         if (full_address == ''):
             return ""
 
+        if (self.debug):
+            return "0,0"
+
         try:
             geocode_result = self.geocoder.geocode(full_address)
             if (geocode_result is None):