Project wont build due to changes grails-data-mapping project

[benrhine]

While researching issue #81 I discovered I could no longer build the project locally. The complaint was

@Override
    public void destroy() throws Exception {

the overridden method did not throw an exception. When looking into the parent method it did previously throw an exception but was recently changed (5/29) rev # be730efdfe3ef67bc3662cb55c85396b1fa10c47 for issue #1099

Update: The related issues in ticket form
grails/grails-data-mapping@be730ef
grails/grails-async@efdce80

[benrhine]

This is fixed by pr #89