replace redis connection temp var with accessor

lib/sidekiq/redis_connection.rb

@@ -15,12 +15,10 @@ module Sidekiq
     end
 
     def self.connect
-      r = Redis.connect(:url => url)
-
       if namespace
-        Redis::Namespace.new(namespace, :redis => r)
+        Redis::Namespace.new(namespace, :redis => redis_connection)
       else
-        r
+        redis_connection
       end
     end
 
@@ -31,5 +29,11 @@ module Sidekiq
     def self.url
       @url || ENV['REDISTOGO_URL'] || 'redis://localhost:6379/0'
     end
+
+    private
+    
+    def self.redis_connection
+      Redis.connect(:url => url)
+    end
   end
 end