Pythonkc-meetups

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* Add option to limit past events returned by get_past_events.
* Added get_events_attendees and get_events_photos to retrieve that info for multiple events in one API request.

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* Fixed: `Don't return "no" RSVPs as attendees <https://github.com/pythonkc/pythonkc-meetups/issues/4>`_

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* Removed explicit dependency on distribute version 0.6.14.
* Switch from httplib2 to requests.

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* Added photos to past events.

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* Added attendees to past events by default.

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* Added ``PythonKCMeetups.get_event_attendees``