Vkontakte

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* more COMPLEX_METHODS are suported.

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* don't raise an exception on json with control characters from vkontakte;
* properly encode request parameters after dumping them to json format.

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* dict, list and tuple arguments are now properly serialized;
* more info is preserved in VKError.

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* properly encode unicode for API calls;
* tox test running.

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* 'get' API calls are fixed;
* tests are added.

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* more magic methods are supported;
* proper timestamp calculation.