[ci skip] Change some log messages' level

'Class Loaded' type of messages flood log files when
log_threshold is set to 2 (debug). They're now logged
as 'info' level.

This is manually applying PR #1528, which was created
to do the same thing, but became outdated.
diff --git a/system/libraries/Parser.php b/system/libraries/Parser.php
index 5a20249..418dd38 100644
--- a/system/libraries/Parser.php
+++ b/system/libraries/Parser.php
@@ -79,6 +79,7 @@
 	public function __construct()
 	{
 		$this->CI =& get_instance();
+		log_message('info', 'Parser Class Initialized');
 	}
 
 	// --------------------------------------------------------------------