Fixes #1243.

* Handle Geocoder::OverQueryLimitError gracefully.

Geocoder::OverQueryLimitError errors were not being generated correctly, and the response was coming back empty but with no indication.

This changes the behavior slightly so that unknown errors are also returned.

* Add error handling tests

* Remove unnecessary config in tests

* Add support for DB-IP.com geocoding service

* Added support for https with paid accounts

* Use `use_https` to distinguish between paid/unpaid API usage

* Clean rubocop warnings

* Update LocationIQ geocoding provider with limits and handle errors

* Correct syntax errors

* Update over limit fixture

* Set HTTPS as the assertion for the URL

* Add missing fixtures for unit tests

* Correct the mistakes in doc

* Let users decide SSL usage

* Revert incorrectly asserted URL without https

* Remove use_ssl from lookup subclass

* Update the assertion of the URL to HTTP and not HTTPS

This is a better way to force HTTPS.

* Allows radius to be a symbol representing a column in DB

* Proposed changes by @alexreisner:

- Keeping branching condition consistent
- Not overwrite the method argument: ‘radius’
- Not assigning two variables in a single line, and
- Add code comments where needed

By “proposed” I meant, I copy/paste them from his comment. But we are
in agreement.

* Fixes broken test in PR

Reverting back to freegeoip.net (from freegeoip.io) as
it appears to be the intended default host (see:
https://github.com/fiorix/freegeoip/issues/165).

* Add place_id search for Google search

* Add place_id example to wiki

* Update README.md

* fix

OpenCage recently added a new optional parameter "abbrv".
Some details: http://blog.opencagedata.com/post/160294347883/shrtr-pls

I noticed this option was in the README, but not in the template, so it
might be nice to have it generated in the template as well.

* Added support for AMap, aka AutoNavi Map, 高德地图

* Try to include amap error info if failed

* Get correct result from amap response

* Fix result error in amap return

* Refactor codes for AMap handling

* Refactor codes for amap result handling

* Refactor amap handling codes

* Fixed coordinates handling error

* Added tests

* Fixded amap result handling and tests

* Lock webmock on 2.3.2 for ruby 1.9.3 support

Maxmind geoip2 returns a collection of names in all available languages
for each field.
This commit allows us to change the language of a single result without
having to reconfigure Geocoder.

* Create methods removing port from ip addresses; Add test

* Update geocoder_reject_non_ipv4_addresses; Add more tests

Update smarty streets results coordinates method to return nil when both latitude and longitude do not exist

cache must respond to #del, not #keys

This reverts commit 1c306367.

Changes batching in the rake task to work using a loop instead of the find_each method which does not work with Mongoid. This should fix #1126.

Value didn't match docs at https://smartystreets.com/docs/cloud/us-street-api

In the sea for example
[Fix #1131]

to_kilometers
to_miles
to_nautical_miles
mi_in_km
km_in_mi
km_in_nm
nm_in_km