Notifier Vertx adapter: removeAllChannels doesn't unsubscribe channels

The vertx adapter for notifier currently has a removeAllChannels privileged method that is called during subscribe if the reset variable is set to true.

https://github.com/aerogear/aerogear-js/blob/Notifier-adapters/src/notifier/adapters/vertx.js#L276

This doesn't actually unsubscribe the channels from the server, just removes them from the channel array.

https://github.com/aerogear/aerogear-js/blob/Notifier-adapters/src/notifier/adapters/vertx.js#L155

the stompws adapter doesn't have this method, it actually calls unsubscribe.

https://github.com/aerogear/aerogear-js/blob/Notifier-adapters/src/notifier/adapters/stompws.js#L221

i would vote to remove the removeAllChannels method and replace it with how the stompws adapter does it