add script to release plugin easily

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21907 35612d4c-9d10-0410-837c-bf9dd1be60d7
fix previous

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21908 35612d4c-9d10-0410-837c-bf9dd1be60d7