[transformer] Support Faye-WebSocket as alternate WebSocket transformer.
[fix] Add WebSocket events listeners for the browser

Despite `faye-websocket` documentation, the same API also works with the Node.js client.
[fix] Handle non-upgrade requests
[deps] Change the versioning scheme of `faye-websocket`
[minor] Remove ws+unix from Faye transformer
[doc] Add documentation for Faye transformer
Merge pull request #260 from primus/faye-ws

Support Faye-WebSocket as alternate WebSocket transformer