Per file python 3 checks and related tests

[insspb]

.:

• api.py
• base.py
• cli.py
• distance.py
• init.py
• keys.py
• location.py
• providers

./providers:

• addresses
• init.py
• ip
• parcels
• reverse
• timezone

./providers/addresses:

• arcgis.py
• baidu.py
• bing_batch_forward.py
• bing_batch.py
• bing.py
• canadapost.py
• gaode.py
• geocodefarm.py
• geocodexyz.py
• geolytica.py
• geonames_children.py
• geonames_details.py
• geonames_hierarchy.py
• geonames.py
• gisgraphy.py
• google_elevation.py
• google_places.py
• google.py
• here.py
• init.py
• komoot.py
• locationiq.py
• mapbox.py
• mapquest_batch.py
• mapquest.py
• mapzen.py
• maxmind.py
• opencage.py
• osm.py
• ottawa.py
• tamu.py
• tgos.py
• tomtom.py
• uscensus_batch.py
• uscensus.py
• w3w.py
• yahoo.py
• yandex.py

./providers/ip:

• freegeoip.py
• init.py
• ipfinder.py
• ipinfo.py

./providers/parcels:

• init.py
• ottawa_parcel.py

./providers/reverse:

• arcgis_reverse.py
• baidu_reverse.py
• bing_batch_reverse.py
• bing_reverse.py
• gaode_reverse.py
• geocodefarm_reverse.py
• gisgraphy_reverse.py
• google_reverse.py
• here_reverse.py
• init.py
• komoot_reverse.py
• locationiq_reverse.py
• mapbox_reverse.py
• mapquest_reverse.py
• mapzen_reverse.py
• opencage_reverse.py
• osm_reverse.py
• uscensus_reverse.py
• w3w_reverse.py
• yandex_reverse.py

./providers/timezone:

• geonames_timezone.py
• google_timezone.py
• init.py