Update for Zabbix 2.2.3

The Zabbix 2.2.3 didn't reorganize the JSON format so I made some changes to be the same as the documentation. 
https://www.zabbix.com/documentation/doku.php?id=2.0/manual/discovery/low_level_discovery#discovery_item_json_format

Also from the $objItem.Description I removed the " " from the text.
Merge pull request #2 from pkleanthous/patch-1

Update for Zabbix 2.2.3