Fixing bugs with custom tasks and adding Windows support

Fixing a bug where tasks named QueueMyExampleTask.php wouldn't be recognized. Also adding support for Windows by checking the PHP_OS
Update README.textile
Fixing issue with data sanitization

Fixing issue where if the job failed the data was not properly sanitized and escaped.
Merge branch 'master' of github.com:challgren/cakephp_queue
Merge branch 'patch-1' of github.com:challgren/cakephp_queue