Big Brother plug-in to check MySQL replication status. Executes SQL: show slave status\G

* Tests Slave_IO_Running and Slave_SQL_Running, both values are "Yes", otherwise this test fails red.

* Tests Seconds_Behind_Master, 60 seconds ($yellowSecBehind) behind = Yellow, 90+ seconds ($redSecBehind) behind - Red.

* Seconds_Behind_Master is in ms so I divide that by 1000 and use int() to round.

* Tested on RH5 and MySQL 5.0.67 but should work on many other *NIX