[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to do the same thing, but became outdated.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/Javascript.php b/system/libraries/Javascript.php
index 94586c0..f0ffa14 100644
--- a/system/libraries/Javascript.php
+++ b/system/libraries/Javascript.php
@@ -85,7 +85,7 @@
 		// make js to refer to current library
 		$this->js =& $this->CI->$js_library_driver;
 
-		log_message('debug', 'Javascript Class Initialized and loaded. Driver used: '.$js_library_driver);
+		log_message('info', 'Javascript Class Initialized and loaded. Driver used: '.$js_library_driver);
 	}
 
 	// --------------------------------------------------------------------