Create v1.3.9 Add release number to all the relevant places

Fix issue 26 Do not cache subscribers.length when publishing topics, as subscribers might change this by subscribing or unsubscribing.

Adding bower configuration, bumping version to 1.3.6 

Fixing package.json for easy use with nodejs 

Adding 'pubsub' as keyword in package.json 

Packaging for distribution via npm 

Adding immediateExceptions option