v0.4.0

• topic based channels using the form 'channelName!topic' anywhere a channel is resolved by name
• STOMP - support for subscribing to remote topics
• exchangeChannel providing basic subscription within a channel for topics
• topicExchangeChannel providing AMQP style topic bindings
• adapters for DOM events
• adapters for Backbone.js events
• removed bus.bridge() use bus.forward() instead
• renamed bus.transform() to bus.transformer()
• renamed WebWorker to MessagePort
• renamed NodeStream to Stream
• moved .inboundGateway() and .outboundGateway() from msgs into msgs/gateways, when.js is now an optional dependency
• bus.on('channel', listener) - syntatic sugar over outboundAdapter
• receive'ing from a queue returns the full message, not just the payload
• update when.js to 3.x, dropping 1.x