Console.log.apply throws in IE9

![screen shot 2014-10-18 at 11 30 54 am](https://cloud.githubusercontent.com/assets/6133142/4690682/f3dd7e6a-56f4-11e4-897d-de7266d0880a.png)

imo this should still perform the debug check and return a value: `return Retsly.debug && /* etc */` or w/e