Updated the off method to clean up the internal objects when removing the last listener for a namespace

Sets whether events of a particular name should be suppressed (not emitted).

Gets whether events of a particular name are being suppressed.

The new on method has an optional namespace parameter

The new off method has an optional namespace parameter

Use eventEmitter.off('event-name', [callback]) instead.

Use eventEmitter.off() instead

Register a callback that will be called whenever an event is emitted under the given name

De-register a callback that was registered under the given name. If called with no arguments, all handlers will be removed from the event emitter for all names and namespaces.