make redis url configurable via app config

config/application.yml.example

@@ -144,6 +144,8 @@ defaults: &defaults
   #Hoptoad api key
   hoptoad_api_key: ''
 
+  #url for a remote redis, on the default port.  Don't forget to restrict IP access!
+  redis_url: ''
 # Use this section to override default settings in specific environments
 development:
   <<: *defaults

config/initializers/resque.rb

@@ -1,5 +1,10 @@
 require 'resque'
 
+
+if !ENV['SINGLE_PROCESS'] && AppConfig[:redis_url]
+  Resque.redis = Redis.new(:host => AppConfig[:redis_url], :port => 6379)
+end
+
 begin
   if ENV['SINGLE_PROCESS']
     if Rails.env == 'production'