errors that occur within functions passed to .on() now produce more d…

…escriptive stack traces.

a single DailyBugle instance can now subscribe to multiple channels.

adds unsubcribe method which allows you to unsubscribe from certain c…

…hannels.

background scripts can now publish messages using PrintingPress.publish

adds function unsubscribeAll which unsubcribes all listeners. Fixes i…

…ssue where an error was thrown if a message was published to an event that nothing was subscribed to.

background scripts can now subscribe to events using PrintingPress. E…

…xample in README to come..

added a README.. not to sure if that's worthy of jumping up one minor…

… version but it's surely not a hotfix. I'm probably just typing to myself here.

version 0.1.0