Added resolve handler and fix for classnames

This will resolve the event immediately, could be used for just trigger emails or pagerduty alert. It could also be used when testing new check. By adding an email handler or some other notiticiation, the result of the check will be resolved and you will be notified without adding alerts to the UI and the normal alerting

Could also be used together with a email handler to notify some other in the company without showing up in the Sensu UI, for example sending an email to customer support for some events that operation team shouldn't handle and don't need to know about

Also fixed class names