activator build fix. 

Fixes the following error:  persistence exception error with [com.beligum.core.models.User] It has not been enhanced but it's superClass [class com.beligum.core.models.BasicModel] is? (You are not allowed to mix enhancement in a single inheritance hierarchy) marker[play.db.ebean.Model]
Merge pull request #2 from ZeerDonker/activatorFix

activator build fix.