preg_replace /e modifier deprecated in PHP 5.5.

The preg_replace /e modifier is deprecated in PHP 5.5. Also need to update $UTF8SpecialChars in RetrieveFMXML.class.php
preg_replace /e modifier deprecated in PHP 5.5.

The preg_replace /e modifier is deprecated in PHP 5.5.
Fix callback function reference
Fix preg_replace callback function

Removed anonymous function and used the one specified in RetrieveFMXML.
Merge pull request #30 from APD183/master

PHP 5.5 deprecates preg_replace /e modifier