Bug 847168 - [User Story] Email Signature

You don't need to do this check.  You will always have this.identity.modifyIdentity() even with the current code  The snafu in the mixin is because tryToCreateAccount returns a wire-protocol representation of the account instead of a wrapped object.  And I think I'm going to request that we fix/address that because that is verrrry ugly right now.  (Technical debt, yay.)