bug 1044607 - remove hasListenerFor
Bug 1037235 - toolkit/loader doesn't check module compatibility r=Mossop
Merge pull request #1621 from erikvold/bug1037235

Bug 1037235 - toolkit/loader doesn't check module compatibility r=Mossop
Merge pull request #1567 from zombie/1044607-hasListenerFor

bug 1044607 - remove hasListenerFor, r=@gozala