[] and []= methods were removed.

Update Geocodio to v1.3

Fixes #1273.

some google geocoding requests have bounds within the result.  add a
helper to extract these.

* Add tests to cover results with no bounds

In this case, calling .bounds should return nil.  Oddly, calling
viewport on a result with no viewport causes the current code to `fail`.
I have preserved this behavior even though I think it to be a little
odd.

but default to HTTPS (custom hosts may not support HTTPS).
This partially reverts 7cb0acc9.

There's no documentation that 20 is the default value for the radius when using near.

Make #near_scope_options public for Rails 5.2

Rails 5.2 changed the receiver within a scope from `klass` to
`relation`. With that, we no longer have private access to
Geocoder::Store::ActiveRecord#near_scope_options, and so must make it
public.

see: https://github.com/rails/rails/pull/29301

This reverts commit 385aafa0.

Should have been part of 7cb0acc9

Should have been part of 7cb0acc9

HTTP support will be discontinued according to this:
https://lists.openstreetmap.org/pipermail/geocoding/2018-January/001918.html

Fixes #1267

for Google Premier. No longer required, according to this page:
https://developers.google.com/maps/premium/overview

Fixes #1268

Update geocod.io to use most recent API version

Updated geocod.io description to reflect that it also supports Canada

see: https://github.com/alexreisner/geocoder/pull/1254#issuecomment-359118927

suggested by @alexreisner

Raise bing errors for statuses 403, 500, 503

Bing returns the status codes within the json response. When a request is
forbidden, it will return a 403. If there is an internal server error,
it will return a 500. And if the service is unavailable for some other
reason, it will return a 503. That information was obtained from bing's
[Status Codes and Error
Handling](https://msdn.microsoft.com/en-us/library/ff701703.aspx)
documentation.

We handle those three status codes here to raise
`Geocoder::RequestDenied` (for 403) and `Geocoder::ServiceUnavailable`
(for 500 and 503). This allows for the users of the Geocoder to handle
those errors in their applications.

Fix Travis CI build errors. Closes #1224

Remove silly check for HTML tags
Add test case for invalid json

Handle IPv6 addresses when removing port numbers in request.location. Closes #1210

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