.......... [ZBXNEXT-826] updated release date and version [2.2.4]

git-svn-id: svn://svn.zabbix.com/trunk@46770 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBXNEXT-826] updated release version [2.2.5rc1]; updated API version [2.2.5]

git-svn-id: svn://svn.zabbix.com/trunk@46773 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBX-954] fix typo; thanks to volter for spotting

git-svn-id: svn://svn.zabbix.com/trunk@46774 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2