Added methods to retrieve payment dates on the payment object
Merge pull request #76 from merk/payment-methods

Added methods to retrieve payment dates on the payment object
Added methods for the dates on a Credit
Merge pull request #77 from merk/payment-methods

Added methods for the dates on a Credit
Added Symfony2.2 support
Merge pull request #82 from tristanbes/master

Added Symfony2.2 support
Merge remote-tracking branch 'upstream/master' into ipn