Fix mixed up key and secret
Fixed bug, which prevented VK backend from picking user data (first_name and last_name)
Update links and API urls: rename vkontatke.ru to vk.com because of social network official rename
Added test for vkontakte oauth2 backend.
Rename vkontakte to vk.com in the code
Adjust documentation to the vkontakte -> vk.com rename
Adjust examples to the vkontakte -> vk.com rename
Merge branch 'vk-fixes' of git://github.com/uruz/python-social-auth into uruz-vk-fixes