Added created and modified to the transaction payment details.

New release with new dependancies

Added support for refunding transactions.

Added support for ProductTypes.

Added autodeploy to Sonatype Maven repo.
Fixed authentication and info request. (v0.3.1)
Updated getservice and images (v0.3.0)

Released version 0.2.0 to Maven repo, so this should be tagged as well

Updated docs to reflect how to install from Maven

Updated readme with example & some more information

Added some missing fields in the TransactionInforResultPaymentDetails…

… class.

Merge branch 'master' of https://github.com/paynl/java-sdk