Python-leetchi

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- Add keep alive feature from requests to store
the http session (thanks to Stéphane Planquart)
- Improve error logging (thanks to Stéphane Planquart)

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- Change the way we handle status codes and errors, reverse orders which only
returns pure objects when status are mostly ok

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- Add Contribution.payment_method_type missing property

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- Add DetailPaymentCard.expiration_date_converted property which translate
expiration_date format in pure date python object

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- Add DetailPaymentCard resource which is a OneToOne from Contribution to
retrieve payment card information

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- Fix AmountField when amount is None