[payment] allow set traversable as payment's details.
[payum] update payum to 0.9
Merge pull request #1608 from formapro-forks/payment-details-allow-traversable

[payment] allow set traversable as payment's details.
Revert "Merge pull request #1620 from formapro-forks/payum-09-upgrade"

This reverts commit d4b294b68ae8257e87cef73bb10261b67c39e139, reversing
changes made to a525a7eb48397e8f09c005fbf03d59a864875dd8.