Merge pull request #15 from jasonculverhouse/master

Added signals for recurring_payment_skipped and recurring_payment_failed
remove redundant use of recurring_failed
Merge pull request #17 from jasonculverhouse/master

Fixed use of recurring_failed in the ipn_tests
Merge branch 'fix_pdt'
Merge branch 'fix_pdt'
Merge branch 'master' into fix_pdt
Change processing result based on the response value.
Fix missing field values with updating current object.