Made PubSub resubscribe hook behave more like the subscribe hook.
Made PubSub channels less verbose in their error reporting.

No errors will be reported on subscription/unsubscription to an unknown channel, on duble subscription/unsubscription or on publishing to an unknown channel. Only some debug logging will be available.
Merge pull request #27 from brainly/idorobots/resubscribe-fix

Made PubSub less verbose in error reporting.