[klarna] add CreditPartAction.
Merge pull request #188 from formapro-forks/klarna-add-credit-part-action

[klarna] add CreditPartAction.
Merge remote-tracking branch 'payum/0.11'
[klarna] add credit part action to factory.
Merge branch '0.11'
[request] BaseModelAware was renamed to Generic
[request] move logic from SecuredXxx requests to Generic, remove SecuredXxx requests.
[request] add missed docblock
Merge pull request #189 from formapro-forks/request-remove-secured

Remove secured requests. Introduce Generic request.
wip