[doc] fix mapping links
[security] add deprecate notes. extend classes from bridge.
[paypal] add notify action in payment factory.
Merge pull request #112 from Payum/paypal-add-notify-action

[paypal] add notify action in payment factory.
Merge pull request #110 from Payum/security-deprecate-classes

[security] add deprecate notes. extend classes from bridge.
Release 0.8.2
fix tests
Merge branch '0.8'