BaseEntityManagerFactory needs to remove @Inject annotation

[deanhiller]

We could not re-use playorm in another Guice bound application since it tries to rebind BaseEntityManagerFactory. That is the only one that should not be allowed to have @Inject annotation and instead should be injected manually in our BootstrapImpl class or something. We can test if it works with MonitorService in playorm which we tried to bind and instead had to manually inject stuff all over the place.