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/user_guide/libraries/trackback.html b/user_guide/libraries/trackback.html
index 513cbf2..6ca1fec 100644
--- a/user_guide/libraries/trackback.html
+++ b/user_guide/libraries/trackback.html
@@ -86,7 +86,7 @@
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'charset'&nbsp;&nbsp;&nbsp;=> 'utf-8'<br />

 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />

 <br />

-if ( ! $this->trackback->send($tb_data))<br />

+if (! $this->trackback->send($tb_data))<br />

 {<br />

 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo $this->trackback->display_errors();<br />

 }<br />

@@ -173,7 +173,7 @@
 &nbsp;&nbsp;&nbsp;&nbsp;$this->trackback->send_error("Unable to determine the entry ID");<br />

 }<br />

 <br />

-if ( ! $this->trackback->receive())<br />

+if (! $this->trackback->receive())<br />

 {<br />

 &nbsp;&nbsp;&nbsp;&nbsp;$this->trackback->send_error("The Trackback did not contain valid data");<br />

 }<br />