added new helper CSecureHeaders

Author: Samuel Akopyan

CHANGELOG

@@ -1,5 +1,6 @@
 Version 1.4.x -
 ----------------------------
+- New: added new helper CSecureHeaders
 - Enh: added possibility to hide system queries in debug panel
 - Enh: added possibility to close debug panel to minimum size
 - Enh: added possibility to get records by chunks with chuck() method of Active Record