fix PaymentCard owner api name
adding ImmediateContribution and RecurrentContribution
Merge pull request #3 from splanquart/master

add answer code and message in contribution (message from payline)
Merge branch 'master' of https://github.com/nidusfr/python-leetchi
Porting to Python 3.3, thanks to ebewe
Update changelog
Add missing decorator to Operation
Add test case for contribution made on the user wallet
Fix typo in docs
Add json response when accessible in APIError and DecodeError exceptions
Fix AmountField when initial amount is None
Remove M2Crypto mentions from README
Fix __repr__ recursion
Use six for __repr__
Add __str__ to BaseApiModel