cleanup
fix for Grails 2.3 and hibernate 3.6.10+, GrailsDomainBinder no longer has static methods, so for the plugin to work with older and newer hibernate plugins create an instance of GrailsDomainBinder (it's still stateless)
Merge pull request #22 from burtbeckwith/master

a small fix to get the plugin working in Grails 2.3.  Will fix build before publish.