Add ability to configure timeout duration.

README.rdoc

@@ -97,8 +97,11 @@ If your model has +address+, +city+, +state+, and +country+ attributes you might
     [address, city, state, country].compact.join(', ')
   end
 
+Please see the code (<tt>lib/geocoder/active_record.rb</tt>) for more methods and detailed information about arguments (eg, working with kilometers).
 
-Please see the code for more methods and detailed information about arguments (eg, working with kilometers).
+You can also set the timeout used for connections to Google's geocoding service. The default is 3 seconds, but if you want to set it to 5 you could put the following in an initializer:
+
+  Geocoder::Configuration.timeout = 5
 
 
 == Reverse Geocoding

lib/geocoder.rb

+require "geocoder/configuration"
 require "geocoder/calculations"
 require "geocoder/lookup"
 require "geocoder/result"

lib/geocoder/configuration.rb

+module Geocoder
+  class Configuration
+    cattr_accessor :timeout
+  end
+end
+
+Geocoder::Configuration.timeout = 3
+

lib/geocoder/lookup.rb

@@ -61,7 +61,7 @@ module Geocoder
       url = query_url(query, reverse)
       begin
         resp = nil
-        timeout(3) do
+        timeout(Geocoder::Configuration.timeout) do
           Net::HTTP.get_response(URI.parse(url)).body
         end
       rescue SocketError, TimeoutError