Now every fake query does not need to be listed in the code, a fixture
just needs to be added.

Changed since pull request was submitted.

Also add test for method presence in all lookups.

Make Geocoder.configure accept a hash (now preferred) and add
Geocoder.config method (for reading config). Deprecate old syntax.

Previously they were testing many things which were not configuration.
All we care about is whether settings are read/writeable via the methods
provided.

This requires changing the way stubs work, so that they only simulate
actual HTTP calls, not cache hits.

Also move API key config to separate method.

Allow lookups to define a cache key (defaults to the query URL) and
define Yahoo's as the non-OAuth-encoded request URL.

Add test and display Yahoo's error message in warning.

This addresses:
https://github.com/alexreisner/geocoder/issues/322

previously the mapquest service was relying on an outdated url
that was just defering to the Nominatum service. This commit
brings in supported Mapquest API support for v1 of their API.

It supports the open (free) tier of the API along with the
licensed version of the service.

Auto-detect which one is being used. It's necessary to continue
supporting 1.0 because of the existing data in people's caches.
See discussion: http://github.com/alexreisner/geocoder/pull/307

Need to be testing that it works without additional requires.

"Results" key is now "Result" and is not an array when only one result.
Update code and response fixtures to reflect this.

"Results" key is now "Result" and is not an array when only one result.

Fixes: #194 - add_exclude_condition breaks on tables without ID field - https://github.com/alexreisner/geocoder/issues/194

This allows searching by, for example, WOEID with Yahoo PlaceFinder.