Assumption that payload data is always JSON

[nivertech]

There is assumption that message payload is JSON:
https://github.com/abhishiv/pusher-node-client/blob/master/lib/pusher-node-client.coffee#L117

Error I getting is:

SyntaxError: Unexpected number
  at Object.parse (native)
  at PusherClient.recieveMessage (/home/xxx/local/node/lib/node_modules/pusher-node-client/lib/pusher-node-client.js:175:51)
  at PusherClient.recieveMessage (/home/xx/local/node/lib/node_modules/pusher-node-client/lib/pusher-node-client.js:6:61)
  at WebSocketConnection.<anonymous> (/home/xxx/local/node/lib/node_modules/pusher-node-client/lib/pusher-node-client.js:140:24)
  at WebSocketConnection.emit (events.js:95:17)
  at WebSocketConnection.processFrame (/home/xxx/local/node/lib/node_modules/pusher-node-client/node_modules/websocket/lib/WebSocketConnection.js:356:26)
  at WebSocketConnection.handleSocketData (/home/xxx/local/node/lib/node_modules/pusher-node-client/node_modules/websocket/lib/WebSocketConnection.js:205:14)
  at CleartextStream.emit (events.js:95:17)
  at CleartextStream.<anonymous> (_stream_readable.js:764:14)
  at CleartextStream.emit (events.js:92:17)
  at emitReadable_ (_stream_readable.js:426:10)
  at _stream_readable.js:419:7
  at process._tickCallback (node.js:419:13)

In my case payload is just a string, not a valid JSON.
The payload is a strings like "00012345|0006789".
The error is:

JSON.parse("00012345|0006789")
SyntaxError: Unexpected number
    at Object.parse (native)
    at repl:1:7
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.emit (events.js:98:17)

One solution is to add additional argument to channel.subscribe function, which will be indicating that there is no need to treat message payloads as JSON.

[abhishiv]

PR welcomed for this topic.