Add error check in bot.getToken function

[macbre]

error:   Request to API failed: %s Error: read ECONNRESET
    at errnoException (net.js:904:11)
    at TCP.onread (net.js:558:19)

TypeError: Cannot read property 'pages' of undefined
    at /home/macbre/github/pyrabot/node_modules/nodemw/lib/bot.js:387:33
    at Request._callback (/home/macbre/github/pyrabot/node_modules/nodemw/lib/api.js:162:5)
    at self.callback (/home/macbre/github/pyrabot/node_modules/nodemw/node_modules/request/request.js:354:22)
    at Request.emit (events.js:95:17)
    at Request.onRequestError (/home/macbre/github/pyrabot/node_modules/nodemw/node_modules/request/request.js:1011:8)
    at ClientRequest.emit (events.js:95:17)
    at Socket.socketErrorListener (http.js:1547:9)
    at Socket.emit (events.js:95:17)
    at net.js:440:14
    at process._tickCallback (node.js:419:13)