bugfix "--args" option on tessel push

I've fixed `--args` option on `tessel push` command.


    ## this works.
    $ tessel run main.js a1b2c3defg
    
    ## cannot pass --args option.
    $ tessel push main.js --args=a1b2c3defg --logs


I've tested following code, It works.
```javascript
var tessel = require('tessel');
var wifi   = require('wifi-cc3000');
var Yo     = require('yo-api');

var yo_api_token = process.argv[2]; // argv from "tesssel run", or --args option from "tessel push"
var yo = new Yo(yo_api_token);

var led_green = tessel.led[0].output(1);
setInterval(function(){
  if(wifi.isConnected()) led_green.toggle()
}, 500);

wifi.reset();

wifi.on('connect', function(){
  console.log('wifi connect');
  yo.yo('SHOKAI', function(err, res, body){ // send YO
    console.log(err);
    console.log(body.toString());
  });
});
```