Limit maxmind local subselect query to reduce cost

Since we only want to select one IP block anyway, limiting this query
reduces the query cost from (cost=22531.65..22539.67 rows=1 width=31)
to (cost=0.53..8.54 rows=1 width=31)

IPv6 loopback ip ::1 should be detected as a valid loopback ip..

Integrate the Google Places Details API

Add IPv6 format detection

See: http://smartystreets.com/kb/liveaddress-api/rest-endpoint

updates smarty streets api key requirements

Document google free API requiring https

I stumbled here, ended up finding the answer in the [issues](https://github.com/alexreisner/geocoder/issues/698). Would be great to document this in the main readme.

Update to Bing on README on usage.

See: https://github.com/alexreisner/geocoder/issues/703

Update so opencagedata will return coordinates.

In the current opencagedata api, latitude and longitude are stored under geometry: {lat: ..., lng: ...}

Allow language to be set in geocoded_by as proc

Refactor SQL statement to prevent table join

Smartystreets is no longer free for non-profits

This should have been part of commit 47e11a41.

Get rid of extraneous "q=" in request query string.