Returns the inner emmit so that migrations can call event accessors.

lib/migration.js

@@ -121,7 +121,7 @@ module.exports = (function() {
               (self.undoneMethods == 0) && callback && callback()
           })
 
-          self.queryInterface[_method].apply(self.queryInterface, args)
+          return self.queryInterface[_method].apply(self.queryInterface, args)
         }
       })(method)
     }