Injected Google Analytics tracker ID configuration into production configuration

config/environments/production.rb

@@ -77,4 +77,9 @@ PrelangTest::Application.configure do
 
   # Use default logging formatter so that PID and timestamp are not suppressed.
   config.log_formatter = ::Logger::Formatter.new
+
+  # [Prelang] Added environment variable
+  GA.tracker = ""
+
 end
+