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* New API version 2014-01-08 changes are reflected in this SDK version:
* implemented `/user/register` and `user/resend_confirmation` calls.
* added `/account/get_update_uri` and `/account/get_reserve_details`
* depricated `/account/add_bank`, `/account/balance`, `/account/get_tax`
and `/account/set_tax` calls.
* restructured SDK in such a way that all API objects are separate classes, so
as an example, if we have a WePay instance ``api = WePay()`` and we want to
make a `/account/find` call, it will look like this ``api.account.find()``
instead of ``api.account_find()`` (notice **.** instead of **_**), although in
this version both are equivalent, latter one is depricated and will be removed
in version 1.3. Despite these changes lookup calls will be the same, ex.
``api.account(12345)``.
* Added flexibility to use different API version per call basis. So it is now
possible to make a depricated call like this: ``api.account.balance(1234,
api_version='2011-01-15')``
* added ``batch_reference_id`` keyword argument to each call that accepts
``batch_mode``