[#591] Support PHP 5.2 in Zend_Xml_Security
[#591] Support PHP 5.2 in Zend_Xml_Security

The patch for ZF2015-06 heavily relied on:

- closures
- ability to invoke arbitrary callables as functions
- shortcut ternary operator

none of which are supported in PHP 5.2. This patch provides PHP 5.2
compatiblity.

Tavy315/zendframework1,Tavy315/zendframework1