Added get_dir_file_info(), get_file_info(), and get_mime_by_extension() to the File Helper.

Changed ( ! condition) into (! condition) within the code
diff --git a/system/libraries/Model.php b/system/libraries/Model.php
index 8181ead..e87d604 100644
--- a/system/libraries/Model.php
+++ b/system/libraries/Model.php
@@ -59,7 +59,7 @@
 		$CI =& get_instance();				

 		foreach (array_keys(get_object_vars($CI)) as $key)

 		{

-			if ( ! isset($this->$key) AND $key != $this->_parent_name)

+			if (! isset($this->$key) AND $key != $this->_parent_name)

 			{			

 				// In some cases using references can cause

 				// problems so we'll conditionally use them