listen functionality

[timaschew]

client side of deepstreamIO/deepstream.io#317

[timaschew]

If accept or rejectis not called in the callback of listen it will show a deprecated warning.

// ++ record API ++
client.record.listen('pattern', (match, isSubscribed, response) => {
  response.accept()
  response.reject()
})

const record = client.record.getRecord('foo/bar')
record.hasProvider // boolean value
// new event
record.on('hasProviderChanged', (hasProvider) => {

})

// ++ event API ++
client.event.listen('pattern', (eventName, isSubscribed, response) => {
  response.accept()
  response.reject()
})