Recordings iter method ignores before and after keywords

Not sure if this is an issue with implementation, documentation or my own reading comprehension - but this behavior was surprising to me:

``` python
>>> end_date
datetime.date(2014, 10, 13)
>>> client.recordings.list(before=end_date)[0].date_created
u'Sun, 12 Oct 2014 23:59:53 +0000'
>>> client.recordings.iter(before=end_date).next().date_created
u'Tue, 13 Oct 2015 17:45:06 +0000'
```
