Python-wepay

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* added ``/account/membership/`` calls.
* added ``/user/mfa/`` calls.
* New API version 2015-09-09 changes are reflected in this SDK version:

* ``/withrawal/create`` is deprecated.

* New API version 2015-08-15 changes are reflected in this SDK version:

* ``/account/create`` now accepts both old and new style params.

* removed deprecated call ``/user/resend_confirmation``.
* ``/account/create`` and ``/account/modify`` now accept ``country_options`` and
``fee_schedule_slot`` params
* added restricted ``/credit_card/transfer`` call.

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* renamed ``user.resend_confirmation`` call to ``user.send_confirmation``.

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* improved documentation.

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* Removed backward compatibility with official `Python WePay SDK <https://github.com/wepay/Python-SDK>`_.
* introduced ``WePayHTTPError``, which is a base exception for both ``WePayClientError`` and ``WePayServerError``
* added ``cached_property`` decorator.
* changed they way calls are initialized. This change doesn't affect the way calls are made.

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* Fixed and improved error handling, new exceptions: ``WePayClientError`` and ``WePayServerError``.

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* Connection ``timeout`` can be specified on per call basis.