Merge pull request #922 from roychri/ruby_2_only_timeout_exception

Replace timeout exception so its compatible with Ruby 1.9.3 too.

lib/geocoder/lookups/base.rb

@@ -283,7 +283,7 @@ def make_api_request(query)
           end
           client.request(req)
         end
-      rescue Net::OpenTimeout, Net::ReadTimeout
+      rescue Timeout::Error
         raise Geocoder::LookupTimeout
       end