Update capability in the track list in the stream

[itwars]

I'm using twitter-node for awhile but it discountinue ... So I decided to move my code to your lib :)

It work perfectly but I need feature that worked on twitter-node :p The track update list ie :

var TwitterNode = require('twitter-node').TwitterNode
  , sys         = require('sys')

var twit = new TwitterNode({
...
 track: ['baseball', 'football'],         // sports!
});
...   
// adds to the track array set above
twit.track('foosball');

We that you could update on the fly the track list from the client without needed to detroy the stream :)