Tests were failing like this:
  <Geocoder::Result::Nominatim> expected but was
  <"Geocoder::Result::Nominatim">

To run a single file, use:

  ruby -I test <filename>

  Example:

    class City < ActiveRecord::Base
      geocoded_by :address, :lookup => lambda{|obj| obj.custom_lookup }

      def custom_lookup
        # return custom lookup for record
      end
    end

Allow to set custom lookup option for Geocoder.search, Geocoder::Query.new and ActiveRecord::Base.(reverse_)geocoded_by

  Examples:

    class City < ActiveRecord::Base
      geocoded_by :address, :lookup => :nominatim
    end

    Geocoder.search("address", :lookup => :nominatim)

This has always been the intended behavior (as shown by the README's
sample code which begins `if results.first`) but it wasn't implemented
properly. Thanks to github.com/nhippenmeyer for pointing it out.

Removed set_defaults from all tests and replaced with teardown to reset the defaults.

Signed-off-by: James McCarthy <james2mccarthy@gmail.com>

Allows custom handling of geocoding service connection problems.

Fixes #56

Instead use a proxy if http_proxy or https_proxy is set. Also revise
code style to be more consistent with rest of library.

Geocoder will try to use environment's http_proxy or https_proxy when doing lookups unless that behaviour has been disabled in the configuration

Also alias as #province and #province_code.

Also add extract_coordinates method and use wherever relevant.

Reported by github.com/joelmats. The array passed to
Geocoder::Calculations.geographic_center was being modified in-place.

Get rid of space after comma, if any (Google was returning no results).

Was ignoring non-ASCII characters. Thanks to github.com/supergivi for
reporting the bug.

Also clean up code comments.

Was preventing other test from running.