I *think* this is a typo.

Right now, whenever I try upgrading to WS, I get:

    Uncaught TypeError: Object #<Transport> has no method 'setInterval'

Did a quick search for WS.prototype.setInterval and I don't see it anywhere. Removing `this` makes the upgrade work correctly.
Merge pull request #145 from MatthewMueller/patch-1

I *think* this is a typo.