Test against different versions of rails

Fixes GH #907.

Fix #906 - Use different memoization variables for request

safe_location and location should not rely on the same variable,
otherwise calling one before the other will yield unexpected results
and could even cause a security risk if location is called before
safe_location

See GH #832.

Not pretty, but it fixes out-of-the-box verbosity issues (see GH #881).

Updated geocodio description

Updated description with additional details

Conflicts:
	lib/geocoder/lookups/base.rb

Test was failing for irrelevant reasons.

This reverts the parts of commit 350567f5
that are outside of the README and should not have been included.

See: http://clubs.ya.ru/mapsapi/replies.xml?item_no=56858

Fix yandex geocoder redirect to https

logger configuration is incompatible with Rails.logger (not really)

Updated Bing offering

Add `supported_protocols` to lookups.

avoid overriding `use_ssl?` or `protocol` directly