Createsend

* Added support basic / unlimited pricing.

* Added support for UnsubscribeSetting field when creating, updating, and
getting list details.
* Added support for including AddUnsubscribesToSuppList and
ScrubActiveWithSuppList fields when updating a list.
* Added support for getting all client lists to which a subscriber with a
specific email address belongs.
* Removed deprecated warnings and disallowed calls to be made in a deprecated
manner.

* Improved documentation to indicate support for Python 2.5, 2.6, and 2.7
* Added support for specifying whether subscription-based autoresponders should
be restarted when adding or updating subscribers.

* Added Travis CI support.
* Added support for newly released team management functionality.

* Added support for compatibility with Python 2.5 by using old "except" syntax.

* Added support for deleting a subscriber.
* Added support for specifying a 'clear' field when updating or importing
subscribers.
* Added support for queuing subscription-based autoresponders when importing
subscribers.
* Added support for retrieving deleted subscribers.
* Added support for including more social sharing stats in campaign summary.
* Added support for unscheduling a campaign.