adds hibernate audit logging and onChange event handlers to GORM domain classes

Shawn Hartsock hartsock@acm.org adds hibernate audit logging and onChange event handlers to GORM domain classes The Audit Logging plugin adds an instance hook to domain objects that allows you to hang Audit events off of them. The events include onSave, onUpdate, onChange, onDelete and when called the event handlers have access to oldObj and newObj definitions that will allow you to take action on what has changed. UrlMappings org.grails.plugins.audit.AuditLogEvent org.grails.plugins.audit.AuditLogEventController