Fixed #274
Fixed #258
Merge pull request #276 from umpirsky/fix/20-08-2013

Fixes
Fixed typo
Merge pull request #282 from carlalexander/patch-1

Fixed typo
add payum bundle and paypal lib to requirments.
add some fields to order for integration with payum.
add payum bundle.
upd finialize step.
update payum libs.
impl basic payment with paypal express checkout.