Code review comment for lp:~gary-lasker/software-center/add-to-launcher-after-auth-lp972710

Thanks for correcting my "explictly" typo along the way :)

I merged this branch with some small tweaks (" def on_transactions_changed(self, backend, pending_transactions):" some comments added to the code. Please re-merge and double check that it makes sense. I left the GObject for now, its a minor thing but feedback on it is still welcome.