citation

expanding citation for forward/backward. modification of the alchemy schema.

ran integration test, but not sure if it succeeds

last few lines:
```
sqlalchemy.exc.OperationalError: (OperationalError) no such table: raw_google u'SELECT raw_google.input_address AS raw_google_input_address \nFROM raw_google \nWHERE raw_google.confidence > ? AND (raw_google.city != ? OR raw_google.region != ?)' (0, '', '')
Starting consolidate...
Traceback (most recent call last):
  File "consolidate.py", line 29, in <module>
    'state': loc.state,
AttributeError: 'NoneType' object has no attribute 'state'
diff: disambiguator.csv: No such file or directory
```