Changed iter method to use cursor pagination API-92

what if you append the params to `url` the first time through? maybe using one of these:

https://docs.python.org/2/library/urlparse.html#urlparse.urlunsplit
https://docs.python.org/2/library/urlparse.html#urlparse.urlunparse

(or if there's a better url library, use that. i'm not familiar with the Python library space)