Revert "Abstracting the loading of files in the config directory depending on environments."

This reverts commit 5c1aa631c5f5ec2f6b75ba1158178418e50ba11a.
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 04f346c..97527e5 100755
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -59,7 +59,14 @@
  *  Load the framework constants
  * ------------------------------------------------------
  */
- 	load_environ_config('constants', TRUE);
+	if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants.php'))
+	{
+		require(APPPATH.'config/'.ENVIRONMENT.'/constants.php');
+	}
+	else
+	{
+		require(APPPATH.'config/constants.php');
+	}
 
 /*
  * ------------------------------------------------------