Revert "Update system/core/Log.php"

This reverts commit bbc6ab4736a896be83e3e3d5f8856374ffa2984c.
diff --git a/system/core/Log.php b/system/core/Log.php
index 2a4728d..0749de8 100644
--- a/system/core/Log.php
+++ b/system/core/Log.php
@@ -71,13 +71,6 @@
 	 * @var string
 	 */
 	protected $_date_fmt		= 'Y-m-d H:i:s';
-	
-	/**
-	 * Log file extension
-	 *
-	 * @var string
-	 */
-	protected $_log_ext		= 'php';
 
 	/**
 	 * Whether or not the logger can write to the log files
@@ -156,7 +149,7 @@
 			return FALSE;
 		}
 
-		$filepath = $this->_log_path.'log-'.date('Y-m-d').'.'.$this->_log_ext;
+		$filepath = $this->_log_path.'log-'.date('Y-m-d').'.php';
 		$message  = '';
 
 		if ( ! file_exists($filepath))
@@ -191,4 +184,4 @@
 }
 
 /* End of file Log.php */
-/* Location: ./system/core/Log.php */
+/* Location: ./system/core/Log.php */
\ No newline at end of file